专题02 表示原因的连词：because, since, as（期中复习讲义）九年级英语上学期北师大版

专题02 表示原因的连词：because, since, as（期中复习讲义） 单元 语法点 常考题型 命题趋势 Unit 3 表示原因的连词：because, since, as 单项选择 1.聚焦情境化应用与文化价值观融合：如在环保、传统文化（如书法、剪纸）、科技发展（如 AI 学习）等话题中，题目要求学生根据语境区分三者的语义强度和逻辑关系。 2.试题渗透社会责任、文化自信等价值导向：（如“因关爱社区参与志愿”和“因热爱传统学习剪纸”），体现 “语言 + 育人” 的命题趋势。 知识点 表示原因的连词：because, since, as 这三个词都能引导 “原因状语从句”，但语气强度、用法场景完全不同。 1. 三者的核心区别 连词 语气强度 核心含义 能否回答 “why” 常见位置 例句（翻译） because 最强 “因为”（直接原因） 能 句首 / 句末 - Why are you late? → Because I missed the bus.（你为什么迟到？因为我错过了公交车。） since 较弱 “既然 / 由于”（原因显而易见） 不能 句首 / 句末 Since you know the rule, you must follow it.（既然你知道规则，就必须遵守。） as 最弱 “由于”（原因更明显，几乎不用强调） 不能 常放句首 As it is raining, we can’t go out.（由于在下雨，我们不能出去了。） 2. 记忆口诀 回答 why，必用 because（语气最强，最直接）； “既然” 这样，用 since（原因大家都知道）； “由于” 小事，用 as（原因太明显，不用多解释）。 注意： 易｜错｜点｜拨 —Why are you so sad? → —Because I lost my pet dog. ❌ —Since/As I lost my pet dog. → ✅— Because I lost my pet dog. 【即时检测】 1．—Is everyone here today? —No. Tom is at home ______ he has got a bad cold. A．because B．if C．until 2．I’m dreaming of a white Christmas ________ it never snows in winter in my hometown. A．or B．because C．if 3．— Do you think I should wear an orange shirt today? — Yes. _________ orange can bring you good luck, it is good for your interview. A．Though B．As C．But D．While 4．—When shall we start, sir? —_________ every one of us is here, let’s start right now. A．Before B．Until C．Since D．While 5．—The sky is much bluer________ we have taken action to protect the environment. —Yes. A．because B．before C．until D．unless 6．— Tom, why do you look so tired today? — Oh, I didn’t get enough sleep ________ I have worked for 12 hours yesterday. A．although B．since C．until D．because 7．It’s hard for us to say goodbye ________ we have so many happy days to remember. A．so        B．because      C．although        D．until 8．Many older buildings in Dalian look beautiful ________ workers make them look as good as new. A．while B．if C．although D．because 9．This pet shop is losing its customers ______ its staff work slowly and often make mistakes. A．so B．because C．until D．although 10．It’s important to keep learning about new ideas and technology ________ the world changes fast. A．so B．or C．unless D．since 11．Most people like the character that looks like Guan Yu, a famous Chinese general in the video games, ________ they believe he can bring good fortune (财运). A．as B．although C．while 12．Bob watches news every day ________ he wonders what’s happening around the world. A．although B．because C．unless 13．— It’s said that Xuzhou Barbecue is famous and delicious. — ______ we are here, why not go and try it? A．Since B．If C．Until D．Whenever 14．________ you didn’t answer my call, I left a message on WeChat. A．If B．As C．While D．Before 15．It’s so hard for us to say goodbye ________ we have so many happy days to remember. A．because B．though C．but 基础通关（测试时间：10分钟） 1．Danny didn’t go to school yesterday ________ he was ill. A．as B．so C．because D．while 2．Why not have a good rest ________ we have not much work to do today? A．even if B．since C．as soon as D．unless 3．— The road up to the top of the mountain is still closed till the snow weather is over. — It’s necessary, ________ it’s dangerous to go up the mountain in the snowy weather. A．if B．whether C．as D．although 4．________ Anhui area of the Yangtze River has improved, many special birds returned. A．Unless B．Though C．Since D．While 5．Let’s go home, ________ it is late. A．so B．and C．as D．but 6．She doesn’t like to watch the action movie ________ there is too much fighting in it. A．whether B．because C．so D．when 7．________ Jingji Road is so popular these days, why not take a city walk there? A．Since B．Though C．Until D．After 8．English is my favorite subject ________ it’s very interesting. A．if B．though C．whether D．as 9．The ancient village finally took on a new look ________ all of us tried to make a change. A．though B．so that C．since D．as if 10．Nowadays museums are becoming more popular ________ people want to learn more about culture and history. A．until B．unless C．as D．although 11．They didn’t come to school on time _________ it rained heavily yesterday. A．because B．because of C．although D．as 12．________ you’ve fully understood the whole lesson, I won’t explain it to you again. A．Unless B．Until C．Since D．When 13．He has got everything ready ________ he may want to go hiking. A．as B．when C．if D．with 14．________ we are here in Liuzhou, why not taste the local Luosifen? A．Though B．Unless C．Because D．Since 15．I like watching CCTV news ________ it can help me learn more about the world. A．if B．because C．so that D．until 重难突破（测试时间：10分钟） 1．Many students lose marks ________ they do not read the questions carefully. A．unless B．so C．before D．because 2．It’s important to keep learning about new technology ______ the world changes so fast. A．so B．or C．since D．unless 3．In Beijing, some 24-hour libraries are very popular with people ________ they are open all the time and in good places with big spaces and other good things. A．even if B．unless C．as D．or 4．________ we have a few minutes to wait for the train, let’s have a cup of coffee. A．Although B．Until C．Since D．Unless 5．Michael was late for school _________ he missed the school bus. A．so B．but C．as D．if 6．—What shall we do to kill time this afternoon? —Well, _______ it’s Star Cinema’s half-price day today, why not go to watch a film? A．since B．while C．unless D．though 7．Norman Bethune is a hero he helped many Chinese soldiers during the war. A．though B．because C．so that D．until 8．—It’s said that Xinyuan mutton tastes delicious. —Well, ________ we are here, why not go to the restaurant and order some? A．though B．unless C．since D．whenever 9．—Mother’s Day is coming. Shall we make a big dinner for Mum? —Good idea! But please give me some guidance (指导), ________ I don’t know how to cook. A．though B．but C．as D．while 10．The idea of “Made in China” caught the world’s attention in the 2023 Asian Games ________ it played a big role in the event. A．if B．unless C．although D．because 11．________ over 400 million adults are too heavy, China has made a plan to help its people with weight control. A．Since B．Unless C．Though D．Until 12．—She may need some help ________ she’s new here. —Let’s help her as much as possible. A．though B．unless C．while D．as 13．Chinese people prefer the color red during the Spring Festival ______ they think red can bring good luck. A．so B．because C．but D．or 14．_________ everybody is here now, let’s begin our meeting. A．With B．For C．If D．Since 15．—Do you think I should wear an orange shirt today? —Yes. ________ orange can bring you good luck, it is good for your interview. A．And B．As C．But D．While 易混易错（测试时间：10分钟） 1．Many silver-haired teachers chose to teach in Xinjiang ________ they wanted to use their knowledge and experience to help improve local education. A．but B．though C．so D．because 2．Learning about new things in technology is really important ________ the world is always changing. A．so B．until C．unless D．since 3．Many wild animals don’t have a safe place to live in ________ villages and farms are growing bigger and taking away their land. A．as B．until C．as long as D．so that 4．________ Chinese paper-cutting carries rich Chinese culture, more people are encouraged to learn it. A．Unless B．Since C．Although D．Until 5．—My grandfather still reads books every day ________ he thinks learning is a journey that never ends. —He sets a good example for us. A．before B．unless C．though D．because 6．Many Chinese people are falling in love with camping ________ long-distance travel is becoming more difficult. A．until B．although C．unless D．since 7．—Let’s go to the science and technology museum now. —OK. ________ it’s raining outside, we’d better take an umbrella and go there by taxi. A．As B．When C．Until D．If 8．I shall not be able to attend the meeting __________ I shall be on a holiday with my family. A．since B．so C．though D．but 9．—Nothing to worry about. He won’t leave until we arrive. —________ time is money, we should not keep others waiting. A．Though B．Unless C．Since D．If 10．More teachers are willing to receive AI training ________ AI technology in helping with teaching becomes more and more popular. A．or B．unless C．because D．though 链接中考（测试时间：15分钟） 1．（2025·江苏连云港·中考真题）________ over 400 million adults are too heavy, China has made a plan to help its people with weight control. A．Since B．Unless C．Though D．Until 2．（2025·天津南开·三模）Peter didn’t buy the bike ______ he got a new one on his birthday last month. A．if B．when C．even D．because 3．（2025·上海·模拟预测）You should go to the clinic right now ________ you don’t feel quite well. A．though B．since C．unless D．until 4．（2023·云南德宏·一模）Maria is always full of energy ________ she takes exercise every day. A．and B．but C．because D．however 5．（2023·重庆沙坪坝·模拟预测）_________ you are free today, could you help me with housework? A．Since B．Though C．Unless D．Until 6．（2022·江苏无锡·模拟预测）Life is like a one-way race, so treasure every moment ________ time cannot be won again. A．so B．as C．if D．unless 7．（2023·江苏徐州·三模）—Indian street food may taste a bit strange. —Well, we are here, why not give it a try? A．if B．although C．unless D．since 8．（2023·重庆铜梁·二模）—Your English has improved so much! How hard-working you are! —I didn’t believe. I could make it _______ I tried my best. A．since B．because C．if D．until 9．（2023·山东东营·二模）—Mum, I failed the test. But I will work hard in the following days. —OK, my boy. ________ you have made the promise, you should keep to it and not give up easily. A．Whether B．Unless C．Since D．Though 10．（2023·黑龙江哈尔滨·三模）I failed to see the newest movie Full River Red(《满江红》) this week _________ there was no ticket available. A．if B．although C．because 11．（2023·江苏扬州·一模）—I hear that you have lived in Yangzhou since you got married. —That’s true. ________ the cost of living in Yangzhou is among the lowest in Jiangsu Province, people live there comfortably and happily. A．Since B．When C．Although D．Unless 12．（2023·安徽·二模）________ you have grown up, you should learn to look after yourselves. A．Since B．Until C．Although D．Unless 13．（2023·福建福州·模拟预测）We are making a big cake for Dad ________ it’s his birthday today. A．because B．until C．once 14．（2023·江苏淮安·一模）—Mother’s Day is coming. Shall we make some nice cards for our mothers? —Good idea! But would you please show me how to make them ________ I am not good at DIY? A．until B．when C．while D．since 15．（2023·四川成都·二模）Travelling is a good way to increase knowledge and open up your mind ________ you can’t fully understand the culture of a place until you go there in person. A．unless B．because C．although 3 / 3 学科网（北京）股份有限公司 $ 专题02 表示原因的连词：because, since, as（期中复习讲义） 单元 语法点 常考题型 命题趋势 Unit 3 表示原因的连词：because, since, as 单项选择 1.聚焦情境化应用与文化价值观融合：如在环保、传统文化（如书法、剪纸）、科技发展（如 AI 学习）等话题中，题目要求学生根据语境区分三者的语义强度和逻辑关系。 2.试题渗透社会责任、文化自信等价值导向：（如“因关爱社区参与志愿”和“因热爱传统学习剪纸”），体现 “语言 + 育人” 的命题趋势。 知识点 表示原因的连词：because, since, as 这三个词都能引导 “原因状语从句”，但语气强度、用法场景完全不同。 1. 三者的核心区别 连词 语气强度 核心含义 能否回答 “why” 常见位置 例句（翻译） because 最强 “因为”（直接原因） 能 句首 / 句末 - Why are you late? → Because I missed the bus.（你为什么迟到？因为我错过了公交车。） since 较弱 “既然 / 由于”（原因显而易见） 不能 句首 / 句末 Since you know the rule, you must follow it.（既然你知道规则，就必须遵守。） as 最弱 “由于”（原因更明显，几乎不用强调） 不能 常放句首 As it is raining, we can’t go out.（由于在下雨，我们不能出去了。） 2. 记忆口诀 回答 why，必用 because（语气最强，最直接）； “既然” 这样，用 since（原因大家都知道）； “由于” 小事，用 as（原因太明显，不用多解释）。 注意： 易｜错｜点｜拨 —Why are you so sad? → —Because I lost my pet dog. ❌ —Since/As I lost my pet dog. → ✅— Because I lost my pet dog. 【即时检测】 1．—Is everyone here today? —No. Tom is at home ______ he has got a bad cold. A．because B．if C．until 【答案】A 【解析】句意：——今天大家都到齐了吗？——没有。汤姆在家，因为他得了重感冒。 考查连词辨析。because因为；if如果；until直到。根据“he has got a bad cold.”可知，汤姆感冒是汤姆在家的原因，空处需用表原因的连词because。故选A。 2．I’m dreaming of a white Christmas ________ it never snows in winter in my hometown. A．or B．because C．if 【答案】B 【解析】句意：我梦想着一个白色的圣诞节，因为在我的家乡冬天从不下雪。 考查连词。or否则；because因为；if如果。根据“I’m dreaming of a white Christmas...it never snows in winter in my hometown.”可知，句子前后部分存在因果关系。前半句“我梦想着白色圣诞节”是结果，后半句“家乡冬天从不下雪”是原因。故选B。 3．— Do you think I should wear an orange shirt today? — Yes. _________ orange can bring you good luck, it is good for your interview. A．Though B．As C．But D．While 【答案】B 【解析】句意：——你认为今天我应该穿桔色的衬衫吗？——是的。因此桔色能带给你好运，它对你的访问是好的。 考查连词的用法。though虽然；as因为；but但是；while然而。分析“orange can bring you good luck”可知，此句是原因。故选B。 4．—When shall we start, sir? —_________ every one of us is here, let’s start right now. A．Before B．Until C．Since D．While 【答案】C 【解析】句意：——我们什么时候出发，先生？——既然大家都来了，我们现在就出发吧。 考查连词辨析。Before在……之前；Until直到；Since由于、既然；While当……时。根据下文“let’s start right now”可知，现在就出发是由于人都到齐了。故选C。 5．—The sky is much bluer________ we have taken action to protect the environment. —Yes. A．because B．before C．until D．unless 【答案】A 【解析】句意：——天空更蓝了，因为我们已经采取行动保护环境。——是的。 考查连词辨析。because因为；before在……之前；until直到；unless除非。根据“we have taken action to protect the environment.”可知这里是解释天空变得更蓝的原因，应是because引导的原因状语从句。故选A。 6．— Tom, why do you look so tired today? — Oh, I didn’t get enough sleep ________ I have worked for 12 hours yesterday. A．although B．since C．until D．because 【答案】D 【解析】句意：——汤姆，你今天怎么看起来这么累？——哦，我没睡好，因为我昨天工作了12个小时。 考查连词辨析。although尽管；since自从；until直到；because因为。根据“I didn’t get enough sleep”和“I have worked for 12 hours yesterday.”可知，汤姆睡眠不足，是因为昨天连续工作了12个小时，前后是因果关系，故用because。故选D。 7．It’s hard for us to say goodbye ________ we have so many happy days to remember. A．so        B．because      C．although        D．until 【答案】B 【解析】句意：我们很难说再见，因为我们有很多快乐的日子要记住。 考查连词辨析。so所以；because因为；although虽然；until直到。后句“we have so many happy days to remember”是前句“It’s hard for us to say goodbye”的原因，用because引导原因状语从句。故选B。 8．Many older buildings in Dalian look beautiful ________ workers make them look as good as new. A．while B．if C．although D．because 【答案】D 【解析】句意：大连的许多老建筑看起来很漂亮，因为工人们使它们看起来像新的一样。 考查连词辨析。while当……的时候；if如果；although虽然；because因为。根据“workers make them look as good as new.”可知，这里是由because引导的原因状语从句。故选D。 9．This pet shop is losing its customers ______ its staff work slowly and often make mistakes. A．so B．because C．until D．although 【答案】B 【解析】试题分析：句意：这个宠物店正在失去它的顾客们因为它的员工工作缓慢且经常犯错误。A. so因此；B. because因为；C. until知道；D. although虽然。根据句意及语境此题应选B。 考点：考查连词的用法 10．It’s important to keep learning about new ideas and technology ________ the world changes fast. A．so B．or C．unless D．since 【答案】D 【解析】句意：不断学习新的想法和技术很重要，因为世界变化很快。 考查连词辨析。so因此；or或者；unless除非；since因为。根据语境可知，“不断学习新的想法和技术”和“世界变化很快”之间是因果关系，且后半句是前半句的原因，应该用since引导原因状语从句。故选D。 11．Most people like the character that looks like Guan Yu, a famous Chinese general in the video games, ________ they believe he can bring good fortune (财运). A．as B．although C．while 【答案】A 【解析】句意：大多数人都喜欢这个长得像关羽的角色，他是中国电子游戏中的一位名将，因为他们相信他能带来好运。 考查连词辨析。as因为；although虽然；while当。前后两句是因果关系，前果后因，用as引导原因状语从句。故选A。 12．Bob watches news every day ________ he wonders what’s happening around the world. A．although B．because C．unless 【答案】B 【解析】句意：Bob每天观看新闻，因为他想知道世界上在发生什么事。 考查连词辨析。although尽管，引导让步状语从句；because因为，引导原因状语从句；unless除非，引导条件状语从句。“he wonders what’s happening around the world”是“Bob watches news every day”的原因，应该用because连接。故选B。 13．— It’s said that Xuzhou Barbecue is famous and delicious. — ______ we are here, why not go and try it? A．Since B．If C．Until D．Whenever 【答案】A 【解析】句意：——据说徐州烧烤远近闻名，味道鲜美。——既然我们在这里，我们为什么不去试试呢？ 考查原因状语从句。Since既然；If如果；Until直到；Whenever无论何时。根据“...we are here, why not go and try it?”可知，此处说明一个已知的理由，用since引导原因状语从句。故选A。 14．________ you didn’t answer my call, I left a message on WeChat. A．If B．As C．While D．Before 【答案】B 【解析】句意：由于你没有接我的电话，所以我在微信上留言了。 考查连词辨析。If如果；As由于，因为；While当……的时候；Before在……以前。根据“...you didn’t answer my call, I left a message on WeChat.”可知，因为对方没接电话，所以我才在微信上留言，前半句是后半句的原因，因此“As”符合语境。故选B。 15．It’s so hard for us to say goodbye ________ we have so many happy days to remember. A．because B．though C．but 【答案】A 【解析】句意：对我们来说很难说再见，因为我们有那么多快乐的日子要记住。 考查连词辨析。because因为，表原因；though尽管，表让步；but但是，表转折。结合题干“It’s so hard for us to say goodbye … we have so many happy days to remember.”可知前后是因果关系，此处表原因。故选A。 基础通关（测试时间：10分钟） 1．Danny didn’t go to school yesterday ________ he was ill. A．as B．so C．because D．while 【答案】C 【解析】句意：Danny昨天没有去上学，因为他生病了。 考查连词辨析。as因为，随着；so因此，所以；because因为；while当……时候，然而。根据语境可知，此处是在解释Danny昨天没有去上学的原因，即他生病了，所以应该用because表示原因。as虽可表原因，但语气较弱，多引导显而易见或附带的原因，且常置于句首，此处语境更侧重直接、明确的因果，不适用。故选C。 2．Why not have a good rest ________ we have not much work to do today? A．even if B．since C．as soon as D．unless 【答案】B 【解析】句意：既然我们今天没有太多工作要做，为什么不好好休息一下呢？ 考查连词辨析。even if即使；since既然；as soon as一……就……；unless除非。根据“Why not have a good rest ... we have not much work to do today?”可知，空后句是前句的原因，用since引导原因状语从句。故选B。 3．— The road up to the top of the mountain is still closed till the snow weather is over. — It’s necessary, ________ it’s dangerous to go up the mountain in the snowy weather. A．if B．whether C．as D．although 【答案】C 【解析】句意：——通往山顶的道路仍然关闭，直到下雪天气结束。——这是必要的，因为下雪天上山很危险。 考查连词辨析。if如果；whether是否；as因为；although虽然。横线前“It’s necessary”是对上面对话的肯定，即下雪天关闭上山的路是很有必要的，横线后所述“it’s dangerous to go up the mountain in the snowy weather.”是关闭道路的原因，因为雪天上山很危险。故选C。 4．________ Anhui area of the Yangtze River has improved, many special birds returned. A．Unless B．Though C．Since D．While 【答案】C 【解析】句意：由于长江安徽段生态环境改善，许多珍稀鸟类回归。 考查连词辨析。Unless除非；Though尽管；Since由于；While当……时。根据“Anhui area of the Yangtze River has improved”与“many special birds returned”之间的因果关系，前半句是后半句的原因，需用表原因的连词。故选C。 5．Let’s go home, ________ it is late. A．so B．and C．as D．but 【答案】C 【解析】句意：让我们回家吧，因为时间太晚了。 考查连词辨析。so所以；and并且；as因为；but但是。横线后“it is late”是前文“Let’s go home”的原因，故选C。 6．She doesn’t like to watch the action movie ________ there is too much fighting in it. A．whether B．because C．so D．when 【答案】B 【解析】句意： 她不喜欢看动作电影，因为里面有太多打斗场面。 考查连词辨析。whether是否；because因为；so所以；when当……时候。根据“She doesn’t like to watch the action movie...there is too much fighting in it.”可知，前后句是因果关系，后句是原因，应用because引导原因状语从句。故选B。 7．________ Jingji Road is so popular these days, why not take a city walk there? A．Since B．Though C．Until D．After 【答案】A 【解析】句意：既然经济路最近这么受欢迎，为什么不去那里来一次城市漫步呢？ 考查连词辨析。Since既然；Though尽管；Until直到；After在……后。根据“Jingji Road is so popular these days, why not take a city walk there?”可知，前一句是后句的原因，应用since引导原因状语从句。故选A。 8．English is my favorite subject ________ it’s very interesting. A．if B．though C．whether D．as 【答案】D 【解析】句意：英语是我最喜欢的科目，因为它非常有趣。 考查连词。if如果；though虽然；whether是否；as因为。横线后解释原因，所以是as。故选D。 9．The ancient village finally took on a new look ________ all of us tried to make a change. A．though B．so that C．since D．as if 【答案】C 【解析】句意：因为我们所有人都努力做出改变，这个古村最终焕然一新 。 考查连词辨析。though虽然/尽管，引导让步状语从句；so that以便/为了，引导目的状语从句；since因为，引导原因状语从句；as if好像，引导方式状语从句。分析句子可知，“努力做出改变”是“古村焕然一新”的原因，此处应用since引导原因状语从句。故选C。 10．Nowadays museums are becoming more popular ________ people want to learn more about culture and history. A．until B．unless C．as D．although 【答案】C 【解析】句意：如今，博物馆变得越来越受欢迎，因为人们想了解更多的文化和历史。 考查连词辨析。until直到；unless除非；as因为；although虽然。根据“people want to learn more about culture and history.”可知，设空处后解释了原因，as符合语境。故选C。 11．They didn’t come to school on time _________ it rained heavily yesterday. A．because B．because of C．although D．as 【答案】A 【解析】句意：他们没有准时到学校，因为昨天下大雨了。 考查连词词义辨析。because因为；because of因为，后接名词；although尽管；as由于，一般位于句首。根据“it rained heavily yesterday.”可知，此处是陈述原因，且为完整的句子，用because引导原因状语从句。故选A。 12．________ you’ve fully understood the whole lesson, I won’t explain it to you again. A．Unless B．Until C．Since D．When 【答案】C 【解析】句意：既然你已经完全理解了整节课，我就不再给你解释了。 考查连词辨析。Unless除非，如果不；引导条件状语从句；Until直到……为止，引导时间状语从句；Since既然，引导原因状语从句；When当……时候，引导时间状语从句。根据“you’ve fully understood the whole lesson”和“you’ve fully understood the whole lesson”可知，我不再解释的原因是因为你完全懂了。故选C。 13．He has got everything ready ________ he may want to go hiking. A．as B．when C．if D．with 【答案】A 【解析】句意：他把一切都准备好了，因为他可能想去远足。 考查词义辨析。as因为；when当……时候；if如果；with和，介词。根据空前后句的句意可知，此处表示原因。故选A。 14．________ we are here in Liuzhou, why not taste the local Luosifen? A．Though B．Unless C．Because D．Since 【答案】D 【解析】句意：既然我们在柳州，为什么不尝尝当地的螺蛳粉呢？ 考查连词辨析。though尽管；unless除非；because因为；since既然。根据“... we are here in Liuzhou, why not taste the local Luosifen”可知，这里不是单纯表示因果关系，而是基于“我们在柳州”这个已知事实，提出“尝尝当地螺蛳粉”的建议，“since”有“既然”之意，用于引导已知原因，故选D。 15．I like watching CCTV news ________ it can help me learn more about the world. A．if B．because C．so that D．until 【答案】B 【解析】句意：我喜欢看中央电视台的新闻，因为它可以帮助我更多地了解世界。 考查连词辨析。if如果；because因为；so that以便；until直到。主句是“我喜欢看央视新闻”，从句是“它能帮助我更多地了解世界”。从句解释了为什么喜欢看央视新闻，前后分句是因果关系，用because引导原因状语从句。故选B。 重难突破（测试时间：10分钟） 1．Many students lose marks ________ they do not read the questions carefully. A．unless B．so C．before D．because 【答案】D 【解析】句意：许多学生丢分是因为他们没有仔细阅读题目。 考查because引导原因状语从句。unless除非；so所以；before在……以前；because因为。根据“Many students lose marks…they do not read the questions carefully.”的语境可知，此处指许多学生丢分的原因，用because引导原因状语从句。故选D。 2．It’s important to keep learning about new technology ______ the world changes so fast. A．so B．or C．since D．unless 【答案】C 【解析】句意：因为世界变化如此之快，所以持续学习新技术很重要。 考查连词辨析。so所以；or或者；since因为；unless除非。根据“It’s important to keep learning about new technology...the world changes so fast.”可知，前后句是因果关系，前果后因，应用since引导原因状语从句。故选C。 3．In Beijing, some 24-hour libraries are very popular with people ________ they are open all the time and in good places with big spaces and other good things. A．even if B．unless C．as D．or 【答案】C 【解析】句意：在北京，一些24小时开放的图书馆很受人们的欢迎，因为它们一直开放，而且处在有大空间和其他好东西的好地方。 考查连词辨析。even if即使，尽管；unless除非；as因为；or或者。根据“In Beijing, some 24-hour libraries are very popular with people...they are open all the time and in good places with big spaces and other good things.”可知，空格前后句为因果关系，前果后因，故此处应用as引导原因状语从句。故选C。 4．________ we have a few minutes to wait for the train, let’s have a cup of coffee. A．Although B．Until C．Since D．Unless 【答案】C 【解析】句意：由于我们还有几分钟等火车，让我们喝杯咖啡吧。 考查连词辨析。Although尽管，引导让步状语从句；Until直到，引导时间状语从句；Since既然，由于，引导原因状语从句；Unless除非，引导条件状语从句。分析语境可知，前半句是一个原因状语从句，空处表示“由于”。故选C。 5．Michael was late for school _________ he missed the school bus. A．so B．but C．as D．if 【答案】C 【解析】句意：迈克尔上学迟到了，因为他错过了校车。 考查连词辨析。so因此（表结果）；but但是（表转折）；as因为（表原因）；if如果（表假设）。根据“missed the school bus”和“late for school”可知，前后之间存在因果关系。故选C。 6．—What shall we do to kill time this afternoon? —Well, _______ it’s Star Cinema’s half-price day today, why not go to watch a film? A．since B．while C．unless D．though 【答案】A 【解析】句意：——我们今天下午做什么来消磨时间呢？——好吧，既然今天是星空影院的半价日，为什么不去看电影呢？ 考查从属连词辨析。since既然，因为（引导原因状语从句）；while当……时候；unless除非；though尽管（引导让步状语从句）。根据“…it’s Star Cinema’s half-price day today, why not go to watch a film”可知，因为今天是星空影院的半价日，所以建议一起去看电影。故选A。 7．Norman Bethune is a hero he helped many Chinese soldiers during the war. A．though B．because C．so that D．until 【答案】B 【解析】句意：诺尔曼・白求恩是一位英雄，因为他在战争期间帮助了许多中国士兵。 考查连词辨析。though尽管，表让步；because因为，引出原因；so that以便，表目的；until直到，表时间。根据“Norman Bethune is a hero”和“he helped many Chinese soldiers during the war”可知，空格后是空格前的原因，所以用because连接，故选B。 8．—It’s said that Xinyuan mutton tastes delicious. —Well, ________ we are here, why not go to the restaurant and order some? A．though B．unless C．since D．whenever 【答案】C 【解析】句意：——据说鑫源羊肉味道鲜美。——嗯，既然我们都来了，为什么不去餐厅点一些呢？ 考查连词辨析。though尽管；unless除非；since既然；whenever无论何时。根据“...we are here, why not go to the restaurant and order some?”可知，既然我们在这里，为什么不去饭店点一些吃呢，since符合语境，引导原因状语从句。故选C。 9．—Mother’s Day is coming. Shall we make a big dinner for Mum? —Good idea! But please give me some guidance (指导), ________ I don’t know how to cook. A．though B．but C．as D．while 【答案】C 【解析】句意：——母亲节快到了。我们为妈妈做一顿丰盛的晚餐好吗？——好主意！但是请给我一些指导，因为我不知道怎样烹饪。 考查连词辨析。though尽管；but但是；as因为；while当……时。“I don’t know how to cook.”是“But please give me some guidance”的原因，用as引导原因状语从句。故选C。 10．The idea of “Made in China” caught the world’s attention in the 2023 Asian Games ________ it played a big role in the event. A．if B．unless C．although D．because 【答案】D 【解析】句意：在2023年亚运会上，“中国制造”的理念引起了世界的关注，因为它在赛事中发挥了重要作用。 考查连词辨析。if如果；unless除非；although尽管；because因为。根据“The idea of ‘Made in China’ caught the world’s attention in the 2023 Asian Games...it played a big role in the event.”可知，后半句是前半句的原因，需用表示因果关系的连词because。故选D。 11．________ over 400 million adults are too heavy, China has made a plan to help its people with weight control. A．Since B．Unless C．Though D．Until 【答案】A 【解析】句意：因为超过4亿成年人体重超标，中国制定了一个计划来帮助人们控制体重。 考查从属连词辨析。Since因为；Unless除非；Though尽管；Until直到。根据“over 400 million adults are too heavy”可知，“超过4亿成年人体重超标”是“制定计划来帮助人们控制体重”的原因，用since引导原因状语从句。故选A。 12．—She may need some help ________ she’s new here. —Let’s help her as much as possible. A．though B．unless C．while D．as 【答案】D 【解析】句意：——她是新来的，可能需要一些帮助。   ——让我们尽可能多地帮助她。 考查连词辨析。though虽然，尽管，引导让步状语从句；unless除非，引导条件状语从句；while当……的时候，引导时间状语从句；as因为，引导原因状语从句。分析句子结构可知，句子“she’s new here.”是前句“She may need some help ”的原因，因此用as引导。故选D。 13．Chinese people prefer the color red during the Spring Festival ______ they think red can bring good luck. A．so B．because C．but D．or 【答案】B 【解析】句意：中国人在春节期间更喜欢红色，因为他们认为红色能带来好运。 考查连词辨析。so所以；because因为；but但是；or或者。根据“they think red can bring good luck.”可知，因为他们觉得红色能带来好运气，所以更喜欢红色。故选B。 14．_________ everybody is here now, let’s begin our meeting. A．With B．For C．If D．Since 【答案】D 【解析】句意：既然大家都到齐了，我们开始开会吧。 考查连词辨析。with带有；for因为；if如果；since既然。根据“everybody is here now, let’s begin our meeting”可知，既然都到齐了，就可以开始开会，应填since符合语境，故选D。 15．—Do you think I should wear an orange shirt today? —Yes. ________ orange can bring you good luck, it is good for your interview. A．And B．As C．But D．While 【答案】B 【解析】句意：——你认为我今天应该穿一件橙色的衬衫吗？——是的。因为橙色能给你带来好运，它对你的面试很有好处。 考查连词辨析。And和；As由于；But但是；While当……时。根据“orange can bring you good luck, it is good for your interview”可知，前后句是因果关系，用as引导原因状语从句，故选B。 易混易错（测试时间：10分钟） 1．Many silver-haired teachers chose to teach in Xinjiang ________ they wanted to use their knowledge and experience to help improve local education. A．but B．though C．so D．because 【答案】D 【解析】句意：许多银发教师选择在新疆教书，因为他们想用自己的知识和经验来帮助改善当地的教育。 考查连词辨析。but但是；though尽管；so所以；because因为。“they wanted to use their knowledge and experience to help improve local education.”是“Many silver-haired teachers chose to teach in Xinjiang”的原因，因此用连词because。故选D。 2．Learning about new things in technology is really important ________ the world is always changing. A．so B．until C．unless D．since 【答案】D 【解析】句意：学习新技术真的很重要，因为世界在不断变化。 考查连词辨析。so所以；until直到；unless除非；since因为。根据“Learning about new things in technology is really important...the world is always changing.”可知，空格后的句子是空格前的句子的原因，需要一个连词引导原因状语从句，故选D。 3．Many wild animals don’t have a safe place to live in ________ villages and farms are growing bigger and taking away their land. A．as B．until C．as long as D．so that 【答案】A 【解析】句意：许多野生动物没有一个安全的地方生活，因为村庄和农场越来越大，夺走了它们的土地。 考查连词辨析。as因为；until直到；as long as只要；so that为了。前后两句是因果关系，此处表示原因，用as引导原因状语从句。故选A。 4．________ Chinese paper-cutting carries rich Chinese culture, more people are encouraged to learn it. A．Unless B．Since C．Although D．Until 【答案】B 【解析】句意：因为中国剪纸承载着丰富的中国文化，所以更多人被鼓励学习它。 考查连词辨析。unless除非；since因为；although虽然，尽管；until直到。根据“Chinese paper-cutting carries rich Chinese culture, more people are encouraged to learn it.”可知，前后句为因果关系，故此处应用since引导原因状语从句。故选B。 5．—My grandfather still reads books every day ________ he thinks learning is a journey that never ends. —He sets a good example for us. A．before B．unless C．though D．because 【答案】D 【解析】句意：——我的祖父仍然每天读书，因为他认为学习是一段永远不会结束的旅程。   ——他为我们树立了一个好榜样。     考查连词辨析。before在……之前；unless除非；though尽管；because因为。根据“reads books every day ”和“he thinks learning is a journey that never ends.”可知，前后句是因果关系，“认为学习是永远不会结束的旅程”是“每天读书”的原因，因此应用because连接。故选D。 6．Many Chinese people are falling in love with camping ________ long-distance travel is becoming more difficult. A．until B．although C．unless D．since 【答案】D 【解析】句意：由于长途旅行变得越来越困难，许多中国人都爱上了露营。 考查连词辨析。until直到；although尽管；unless除非；since因为。根据“long-distance travel is becoming more difficult.”可知此句和上文之间存在因果关系，用连词since，故选D。 7．—Let’s go to the science and technology museum now. —OK. ________ it’s raining outside, we’d better take an umbrella and go there by taxi. A．As B．When C．Until D．If 【答案】A 【解析】句意：——我们现在去科技馆吧。——好的。因为外面正在下雨，我们最好带把伞，然后乘出租车去那里。 考查连词辨析。as由于；when当……时；until直到；if如果。根据“it’s raining outside, we’d better take an umbrella and go there by taxi”可知，此处是解释带着伞，坐出租车去那里的原因，故选A。 8．I shall not be able to attend the meeting __________ I shall be on a holiday with my family. A．since B．so C．though D．but 【答案】A 【解析】句意：因为我要和家人一起度假，所以我不能参加会议。 考查连词辨析。since因为；so所以；though虽然；but但是。分析句子可知，“I shall not be able to attend the meeting”的原因是“I shall be on a holiday with my family.”，用since引导。故选A。 9．—Nothing to worry about. He won’t leave until we arrive. —________ time is money, we should not keep others waiting. A．Though B．Unless C．Since D．If 【答案】C 【解析】句意：——没什么好担心的。直到我们到达他才会离开。——既然时间就是金钱，我们就不应该让别人等待。 考查连词辨析。Though虽然；Unless除非；Since既然；If如果。根据“... time is money, we should not keep others waiting.”可知，前后两句为因果关系，应用since引导原因状语从句，故选C。 10．More teachers are willing to receive AI training ________ AI technology in helping with teaching becomes more and more popular. A．or B．unless C．because D．though 【答案】C 【解析】句意：更多的老师愿意去接受AI培训，因为AI科技在辅助教学方面变得越来越受欢迎。 考查连词辨析。or或者；unless除非；because因为；though尽管。根据“AI technology...becomes more and more popular.”可知空后的句子表示老师选择AI培训的原因，用because引导原因状语从句，故选C。 链接中考（测试时间：15分钟） 1．（2025·江苏连云港·中考真题）________ over 400 million adults are too heavy, China has made a plan to help its people with weight control. A．Since B．Unless C．Though D．Until 【答案】A 【解析】句意：因为超过4亿成年人体重超标，中国制定了一个计划来帮助人们控制体重。 考查从属连词辨析。Since因为；Unless除非；Though尽管；Until直到。根据“over 400 million adults are too heavy”可知，“超过4亿成年人体重超标”是“制定计划来帮助人们控制体重”的原因，用since引导原因状语从句。故选A。 2．（2025·天津南开·三模）Peter didn’t buy the bike ______ he got a new one on his birthday last month. A．if B．when C．even D．because 【答案】D 【解析】句意：彼得没有买这辆自行车，因为他上个月生日那天得到了一辆新的。 考查连词辨析。if如果；when当；even甚至；because因为。后句是前句的原因，用because引导原因状语从句。故选D。 3．（2025·上海·模拟预测）You should go to the clinic right now ________ you don’t feel quite well. A．though B．since C．unless D．until 【答案】B 【解析】句意：你应该马上去诊所，因为你感觉不太舒服。 考查连词辨析。though虽然 ；since因为；unless除非；until直到。根据“you don’t feel quite well.”可知，后文解释了原因，since符合语境。故选B。 4．（2023·云南德宏·一模）Maria is always full of energy ________ she takes exercise every day. A．and B．but C．because D．however 【答案】C 【解析】句意：玛丽亚总是精力充沛，因为她每天都锻炼。 考查连词辨析。and并且；but但是；because因为；however不管怎样。根据“Maria is always full of energy...she takes exercise every day.”可知，因为她每天都锻炼，所以她总是精力充沛，应用because引导原因状语从句。故选C。 5．（2023·重庆沙坪坝·模拟预测）_________ you are free today, could you help me with housework? A．Since B．Though C．Unless D．Until 【答案】A 【解析】句意：既然你今天有空，你能帮我做家务吗？ 考查从属连词辨析。Since既然；Though尽管；Unless除非；Until直到。根据“you are free today”可知，今天有空，就可以帮忙做家务，此处应用since引导原因状语从句。故选A。 6．（2022·江苏无锡·模拟预测）Life is like a one-way race, so treasure every moment ________ time cannot be won again. A．so B．as C．if D．unless 【答案】B 【解析】句意：生活就像单程赛，所以珍惜每个时刻，因为时光一去不复返。 考查连词辨析。so所以；as因为；if如果；unless除非；根据句意，珍惜每个时刻……时光一去不复返，可知此处用as，表示“因为”。故选B。 7．（2023·江苏徐州·三模）—Indian street food may taste a bit strange. —Well, we are here, why not give it a try? A．if B．although C．unless D．since 【答案】D 【解析】句意：——印度街头食物可能尝起来有点怪。——嗯，既然我们在这儿，为什么不试一试。 考查连词。if如果；although虽然；unless除非；since既然。分析句子可知，横线上的词引导后面的原因状语从句，所以是since。故选D。 8．（2023·重庆铜梁·二模）—Your English has improved so much! How hard-working you are! —I didn’t believe. I could make it _______ I tried my best. A．since B．because C．if D．until 【答案】B 【解析】句意：——你的英语进步很大！你真努力啊！——我不敢相信。我能成功因为我尽最大努力了。 考查连词辨析。since自从，既然；because因为；if如果；until直到。根据“I could make it … I tried my best”可知，成功是因为尽了最大的努力，空格后表示成功的直接原因，用because引导原因状语从句，故选B。 9．（2023·山东东营·二模）—Mum, I failed the test. But I will work hard in the following days. —OK, my boy. ________ you have made the promise, you should keep to it and not give up easily. A．Whether B．Unless C．Since D．Though 【答案】C 【解析】句意：——妈妈，我考试不及格。但我会在接下来的日子里努力学习。——好的，我的孩子。既然你已经做出了承诺，就应该信守诺言，不要轻易放弃。 考查连词辨析。Whether是否，引导名词性从句；Unless除非，引导条件状语从句；Since既然，引导原因状语从句；Though虽然，引导让步状语从句。根据“…you have made the promise, you should keep to it”可知，既然做了承诺，就要信守。故选C。 10．（2023·黑龙江哈尔滨·三模）I failed to see the newest movie Full River Red(《满江红》) this week _________ there was no ticket available. A．if B．although C．because 【答案】C 【解析】句意：这周我没能去看最新的电影《满河红》，因为没有票了。 考查连词辨析。if如果；although尽管；because因为。空格后“there was no ticket available”是解释没能去看电影的原因，故选C。 11．（2023·江苏扬州·一模）—I hear that you have lived in Yangzhou since you got married. —That’s true. ________ the cost of living in Yangzhou is among the lowest in Jiangsu Province, people live there comfortably and happily. A．Since B．When C．Although D．Unless 【答案】A 【解析】句意：——我听说你结婚后一直住在扬州。——这是真的。由于扬州是江苏省生活成本最低的城市之一，人们在那里生活得舒适而快乐。 考查连词辨析。Since因为，由于；When当……时；Although尽管；Unless除非。分析语境可知，“扬州是江苏省生活成本最低的城市之一”是“人们在那里生活得舒适而快乐”的原因，故用Since引导原因状语从句。故选A。 12．（2023·安徽·二模）________ you have grown up, you should learn to look after yourselves. A．Since B．Until C．Although D．Unless 【答案】A 【解析】句意：既然你已经长大了，你就应该学会照顾自己。 考查连词辨析。Since既然；Until直到；Although尽管；Unless除非。根据“you should learn to look after yourselves”和“you should learn to look after yourselves”可知二者为因果关系，故选A。 13．（2023·福建福州·模拟预测）We are making a big cake for Dad ________ it’s his birthday today. A．because B．until C．once 【答案】A 【解析】句意：我们正在为爸爸做一个大蛋糕，因为今天是他的生日。 考查连词辨析。because因为；until直到；once一旦。“it’s his birthday today”是“We are making a big cake for Dad”的原因，用because引导原因状语从句。故选A。 14．（2023·江苏淮安·一模）—Mother’s Day is coming. Shall we make some nice cards for our mothers? —Good idea! But would you please show me how to make them ________ I am not good at DIY? A．until B．when C．while D．since 【答案】D 【解析】句意：——母亲节就要到了。我们为我们的妈妈做一些漂亮的卡片好吗？——好主意！但是你能告诉我怎么做吗？因为我不擅长DIY。 考查连词辨析。until直到；when当……时；while当……时；since因为。“I am not good at DIY”是“But would you please show me how to make them”的原因，用since引导原因状语从句。故选D。 15．（2023·四川成都·二模）Travelling is a good way to increase knowledge and open up your mind ________ you can’t fully understand the culture of a place until you go there in person. A．unless B．because C．although 【答案】B 【解析】句意：旅行是增加知识和开拓思维的好方法，因为你不能完全了解一个地方的文化，直到你亲自去那里。 考查连词辨析。unless除非；because因为；although尽管。“you can’t fully understand the culture of a place until you go there in person”是“旅行是增加知识和开拓思维的好方法”的原因，前果后因，用because引导原因状语从句。故选B。 3 / 3 学科网（北京）股份有限公司 $