Unit 5 Art world 语法Grammar 原因状语从句-2025-2026学年九年级英语上册单元语法精讲精练（牛津译林版）

班级 姓名 学号 分数 Unit 5 Art world 原因状语从句 （时间：60分钟，满分：100分） 原因状语从句（Adverbial Clause of Reason）用于说明主句动作或状态发生的原因，由特定的从属连词引导。它是英语中表达因果逻辑的核心结构之一，能使句子更丰富、逻辑更清晰。 一、核心引导词及用法对比 从属连词 语气强弱 位置特点 例句解析 because ★★★最强（直接原因） 可放主句前（用逗号隔开）或后 Because it rained heavily, the match was canceled. （因为下大雨，比赛取消了 → 强调直接原因） He failed because he didn’t study.（他因没学习而失败） since ★★☆较强（已知原因） 多放句首，表“既然” Since you’re tired, rest now. （既然你累了，现在休息吧 → 原因双方已知） as ★☆☆较弱（附带说明） 多放句首 As it was getting dark, we went home. （天色渐晚，我们回家了 → 原因非重点） for ★☆☆最弱（补充原因） 只能放主句后，前加逗号 She must be ill, for she looks pale. （她一定病了，因为她脸色苍白 → 补充推断依据） 重点区别： because 回答 “Why?”（强因果） — Why was the match canceled? — Because it rained. since/as 常用于已知背景（≈ “鉴于”） for 是并列连词（非从属连词），表推断依据（≈ “由于”），不用于句首。 二、位置与标点规则 1. 从句在前：用逗号与主句隔开 Because he was late, he missed the bus. As she forgot her keys, she couldn’t enter. 2. 从句在后：通常不加逗号（for除外） He missed the bus because he was late. She couldn’t enter as she forgot her keys. ✅ It must be snowing, for it’s so cold.（for前必须加逗号） 三、易错点及避坑指南 1. because 与 so 不能连用！ ❌ Because he was tired, so he left early. （错误！） ✅ Because he was tired, he left early. ✅ He was tired, so he left early. 2. since/as 避免与“自从”混淆 原因：Since you know it, tell me. （既然你知道，告诉我吧） 时间：He has changed since he moved here. （自从搬来后他变了） 3. for 不能替换直接强原因 ❌ He failed for he didn’t study. （语义弱，不自然） ✅ He failed because he didn’t study. 1、 单项选择(本大题共40小题，每小题2分，共80分) 1．David had to stay in the hospital ________ he hurt his head. A．or B．so C．but D．because 【答案】D 【详解】句意：大卫不得不待在医院里，因为他伤了头。 考查连词辨析。or或者；so因此；but但是；because因为。分析题干可知，后句是前句的原因，结合选项可知，应用because引导此原因状语从句。故选D。 2．Fish can only live in the water ________ there are cats on the shore (岸)! A．and B．although C．but D．because 【答案】D 【详解】句意：鱼只能在水里生活，因为岸上有猫！ 考查连词辨析。and和；although虽然；but但是；because因为。“there are cats on the shore”是“Fish can only live in the water”的原因，用because引导原因状语从句，故选D。 3．Tony never spends any money in buying book, _________ he doesn’t like reading. A．so B．because C．although D．because of 【答案】B 【详解】句意：托尼从不花钱买书，因为他不喜欢读书。 考查连词。so因此；because因为；although虽然；because of由于。根据“Tony never spends any money in buying book…he doesn’t like reading.”可知是指托尼从不花钱买书，因为他不喜欢读书，because引导原因状语从句。故选B。 4．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 【详解】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。 5．—Dad, could I have more chocolate? —You’d better not ________ too much sweet food is harmful to your health. A．if B．before C．though D．because 【答案】D 【详解】句意：——爸爸，我可以再来点巧克力吗？——你最好不要，因为吃太多甜食对你的健康有害。 考查连词辨析。if如果；before在……之前；though虽然；because因为。根据“You’d better not...too much sweet food is harmful to your health.”可知最好不要吃太多巧克力，因为吃太多对健康有害，用because引导原因状语从句。故选D。 6．People often give me fans as presents __________ they know I like them. A．because B．while C．so D．before 【答案】A 【详解】句意：人们经常送我扇子作为礼物，因为他们知道我喜欢扇子。 考查从属连词辨析。because因为；while当……时候；so因此；before在……之前。由“People often give me fans as presents…they know I like them”可知，人们送扇子给我是因为我喜欢扇子，应用because引导原因状语从句。故选A。 7．—Look, there are more and more electric cars driving along the street. —Yeah. They are a big hit _________ they produce less air pollution. A．unless B．though C．but D．because 【答案】D 【详解】句意：——看，街上行驶着越来越多的电动汽车。——是的。它们大受欢迎，因为它们产生的空气污染更少。 考查连词辨析。unless除非；though尽管；but但是；because因为。根据空处前后句可知，后句是前句的原因，应用because引导原因状语从句，故选D。 8．My phone bill is high ________ I have lots of friends and we like to talk on the phone. A．or B．so C．but D．because 【答案】D 【详解】句意：我的电话话费很高，因为我有许多朋友，而且我们喜欢在电话上聊天。 考查连词辨析。or或者；so所以；but但是；because因为。根据“I have lots of friends and we like to talk on the phone”可知，因为我有许多朋友，我们喜欢在电话上聊天，所以我的电话费很高，所以用because引导原因状语从句。故选D。 9．—Did Alice write back to Mr. Smith? —She didn’t have to, ________ she’ll visit him tomorrow. A．though B．unless C．when D．because 【答案】D 【详解】句意：——爱丽丝给史密斯先生回信了吗？ ——她没必要，因为她明天要去看他。 考查连词辨析。though尽管；unless除非；when当……时候；because因为。根据“she’ll visit him tomorrow.”可知，这是她不必给史密斯先生回信的原因，应用because来引导句子。故选D。 10．We didn’t enjoy the holiday ________ the weather was so awful. A．though B．if C．unless D．because 【答案】D 【详解】句意：我们不喜欢这个假期，因为天气太糟糕了。 考查连词辨析。though虽然；if如果；unless除非；because因为。前后是因果关系，前果后因，用because引导原因状语从句。故选D。 11．________ you know little about this art form, you can find a book to learn. A．Though B．While C．When D．Since 【答案】D 【详解】句意：既然你对这种艺术形式知之甚少，你可以找本书来学习。 考查连词辨析。Though尽管；While然而；When当……时候；Since既然，因为。根据“...you know little about this art form, you can find a book to learn.”可知，前句“对艺术形式了解甚少”是后句“学习”的原因，设空处引导原因状语从句，选项D符合语境。故选D。 12．He didn’t go to school ________ he was ill. A．so B．because C．or D．so that 【答案】B 【详解】句意：他没去上学，因为他病了。 考查连词辨析。so因此；because因为；or或者；so that以便。根据语境可知，空格后在陈述原因，故应用because引导原因状语从句。故选B。 13．I always get up early on weekdays ________ I’m afraid I will be late for school. A．though B．because of C．so D．because 【答案】D 【详解】句意：我在工作日总是起床很早，因为我害怕我会上学迟到。 考查连词辨析。though 尽管；because of 因为，of为介词，后面跟名词、代词、动名词；so 所以；because 因为。我怕上学迟到是我起床早的原因，且空后为一个句子，应用because。故选D。 14．_________ you are free today, could you help me with housework? A．Since B．Though C．Unless D．Until 【答案】A 【详解】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。 15．We all like our Chinese teacher _________ she is kind and patient. A．unless B．though C．whether D．because 【答案】D 【详解】句意：我们所有人都很喜欢语文老师，因为她和蔼且有耐心。 考查从属连词辨析。unless除非；though虽然；whether是否；because因为。根据“We all like our Chinese teacher...she is kind and patient.”可知，所有人都喜欢语文老师的原因是她和蔼且有耐心，空处应是because，引导原因状语从句。故选D。 16．—Tony, who is your favourite writer? —Mark Twain. I like him _________ he wrote many interesting stories. A．or B．so C．but D．because 【答案】D 【详解】句意：——Tony，你最喜欢的作家是谁？——马克·吐温。我喜欢他，因为他写了许多有趣的故事。 考查连词辨析。or或者；so因此；but但是；because因为。根据句意可知，“he wrote many interesting stories”是“I like him”的原因，所以空处用because引导原因状语从句。故选D。 17．John lost his way in the field, ________ the ground was covered with thick snow. A．or B．for C．but D．so 【答案】B 【详解】句意：约翰在田野里迷了路，因为地上覆盖着厚厚的积雪。 考查连词辨析。or或者；for因为；but但是；so因此。“the ground was covered with thick snow”是“John lost his way in the field”的原因，用for连接。故选B。 18．It’s hard for us to say goodbye _________ we have so many happy days to remember. A．unless B．because C．until D．although 【答案】B 【详解】句意：我们很难说再见，因为我们有那么多快乐的日子要记住。 考查连词辨析。unless除非；because因为；until直到；although尽管。根据“It’s hard for us to say goodbye...we have so many happy days to remember.”可知后句是前句的原因，应用because，故选B。 19．—The local food may taste a little strange. —Well, ________ we are here, why not give it a try? A．though B．although C．since D．because 【答案】C 【详解】句意：——当地的食物可能尝起来有点奇怪。——噢，既然我们都来了，为什么不试试呢？ 考查连词辨析。though尽管；although尽管；since既然；because因为。根据“we are here, why not give it a try”可知，既然都在这，所以建议试一试，故选C。 20．—Hi, Mike! Would you like to fly kites with me? —I’d like to go but I can’t, ________ I have to finish my question survey first. A．because B．until C．so D．while 【答案】A 【详解】句意：——你好，迈克！你愿意和我一起放风筝吗？——我很想去，但是我不能去，因为我必须先完成我的问题调查。 考查连词辨析。because因为；until直到；so因此；while当……时。“I have to finish my question survey first”是“I’d like to go but I can’t”的原因，用because引导原因状语从句。故选A。 21．The family had to stay at the hotel ________ it was raining hard. A．although B．because C．until D．unless 【答案】B 【详解】句意：因为雨下得很大，这家人不得不住在旅馆里。 考查从属连词。although尽管；because因为；until直到；unless除非。根据语境可知，此处存在因果关系，空格后为原因，故应用because引导原因状语从句。故选B。 22．Our school holds a reading festival on April 8th every year ________ it can encourage students to read more books. A．although B．because C．unless D．until 【答案】B 【详解】句意：我们学校每年4月8日举办读书节，因为它能鼓励学生们读更多的书。 考查连词辨析。although虽然；because因为；unless除非；until直到。我们学校每年4月8日都会举办读书节，“因为”它可以鼓励学生多读书，后句是前句的原因，用because引导原因状语从句。 故选B。 23．I love going to school ________ everyone in my class is friendly. A．before B．although C．because D．unless 【答案】C 【详解】句意：我喜欢去上学，因为我班级的每个人都很友好。 考查连词辨析。before在……之前；although尽管；because因为；unless除非。“我班级的每个人都很友好”是解释喜欢去上学的原因，用because引导原因状语从句，故选C。 24．She had to stop running ________ she hurt her left knee in the sports meeting. A．because B．so C．but D．although 【答案】A 【详解】句意：她不得不停止跑步，因为她在运动会上伤了左膝。 考查连词辨析。because因为；so因此；but但是；although虽然。“she hurt her left knee in the sports meeting”是“She had to stop running”的原因，用because引导原因状语从句，故选A。 25．Many wild animals don’t have a safe place to live, ________ villages and farms are growing bigger and taking away their land. A．because B．until C．although D．before 【答案】A 【详解】句意：很多野生动物没有安全的地方住，因为村子和农场正在逐渐扩大，夺走了它们栖息之地。 考查连词。because因为；until直到；although尽管；before在……之前。根据“don’t have a safe place to live”及“villages and farms are growing bigger and taking away their land”可知，后面的句子表达原因，用连词“because”。故选A。 26．—Mum, may I have more chocolate? —You’d better not ________ too much sweet food is bad for health. A．until B．while C．although D．because 【答案】D 【详解】句意：——妈妈，我可以再多点巧克力吗？——你最好不要，因为太多的甜食对你的健康不好。 考查连词辨析。until直到；while当……时；although尽管；because因为。根据“You’d better not… too much sweet food is bad for health”可知，空格后是在解释不能多吃甜食的原因，用because引导原因状语从句，故选D。 27．The day must be breaking, ________ the birds have begun singing. A．because B．as C．for D．since 【答案】C 【详解】句意：天一定亮了，因为鸟儿已经开始唱歌了。 考查连词辨析。because因为，即用于首句，也可用于末句，表示直接原因，别人不知道的原因；as因为，表示已经知道的原因；for因为，对结果作出解释说明；since因为，强调双方已知，不需多解释的原因，根据空前的“The day must be breaking”和空后的“the birds have begun singing”可知，此处是在解释说明，故选C。 28．________ all the passengers are here, why don’t we start at once? A．As soon as B．After C．Now that D．When 【答案】C 【详解】句意：既然所有的乘客都到了，我们何不马上出发呢？ 考查连词辨析。As soon as一……就……；After在……之后；Now that既然；When当……时候。根据“ all the passengers are here”及“why don’t we start at once?”可知既然乘客都到了，为什么不立马出发呢，前后句是因果关系，故选C。 29．—The light in his room is still on. Do you know why he stays up so late? — _______  prepare for the coming exam. A．In order that B．So that C．In order to D．Because 【答案】C 【详解】句意：—— 他房间的灯还亮着。你知道他为什么这么晚才睡吗？—— 为即将到来的考试做准备。 考查短语辨析。in order that为了，后接句子； so that为了，后接句子； in order to为了，后接短语或单词； because因为，后接句子。根据“prepare for the coming exam”可知，不是完整的句子，结合选项，A、B、D选项均是接完整的句子，因此C符合句意。故选C。 30．She didn’t send the e-mail yesterday _________ it was too late. A．if B．after C．before D．because 【答案】D 【详解】句意：她昨天没有发电子邮件，因为太晚了。 考查连词辨析。if如果；after在……之后；before在……之前；because因为。根据“She didn’t send the e-mail yesterday...it was too late.”可知，前后句子是因果关系，应用连词because连接。故选D。 31．—Have you returned Helen’s call? —I don’t need to ________ I’ll see her tomorrow. A．if B．unless C．so D．because 【答案】D 【详解】句意：——你给海伦回电话了吗？——我不需要回，因为我明天就要见到她了。 考查从属连词辨析。if如果；unless除非；so所以；because因为。根据“I don’t need to”以及“I’ll see her tomorrow.”可知，此空是因为，表示原因。故选D。 32．It’s easy to find a good bookshop in our city ________ we have many ones here. A．because B．so C．though D．when 【答案】A 【详解】句意：在我们城市很容易找到一家好的书店，因为我们这里有很多。 考查连词辨析。because因为，表原因；so所以，表结果；though尽管，表让步；when当……的时候，表时间。根据题干“It’s easy to find a good bookshop in our city…we have many ones here”，可知前后是因果关系；前句表果后句表因需用because，故选A。 33．In China, we always use red paper for Hongbao ________ red means luck. A．until B．if C．although D．because 【答案】D 【详解】句意：在中国，我们总是用红纸做红包，因为红色意味着幸运。 考查连词辨析。until 直到；if 如果；although 尽管；because 因为。根据题干“we always use red paper for Hongbao…red means luck”，可知前后是因果关系，后句表原因，设空处需填连词 because。故选D。 34．Poor Kate didn’t go to school today ________ she hurt her leg. A．so that B．if C．before D．because 【答案】D 【详解】句意：可怜的凯特今天没去上学，因为她伤了腿。 考查连词。so that为了；if如果；before在……之前；because因为；空格前后句之间是因果关系，属于“前果后因”，应用because引导原因状语从句，故选D。 35．_______ China is growing stronger and stronger, Chinese is taught in more and more countries. A．If B．Unless C．As D．Although 【答案】C 【详解】句意：因为中国越来越强大，越来越多的国家教授汉语。 考查连词辨析。if如果；unless除非；as因为；although虽然。分析“…China is growing stronger and stronger, Chinese is taught in more and more countries.”可知，此处表示“因为中国越来越强大”，强调原因，用as引导原因状语从句，故选C。 36．My father came back late last night _________ his car broke down on the way. A．so B．because C．but D．although 【答案】B 【详解】句意：我父亲昨晚很晚才回来，因为他的车在路上抛锚了。 考查连词辨析。so所以；because因为；but但是；although虽然。“his car broke down on the way”是“My father came back late last night”的原因，所以用because引导原因状语从句。故选B。 37．We did not have fun on the day _________ the weather was too cold. A．or B．because C．but D．so 【答案】B 【详解】句意：那天我们玩得不开心，因为天气太冷了。 考查连词辨析。or否则；because因为；but但是；so因此。“天气太冷”是“我们那天玩得不开心”的原因，用because引导原因状语从句。故选B。 38．—Jenny was sad ________ she didn’t pass the math exam. —Let’s cheer her up. A．because B．and C．but D．if 【答案】A 【详解】句意：——珍妮很伤心，因为她没有通过数学考试。——让我们使她高兴起来。 考查连词辨析。because因为；and并且；but但是；if如果。根据句中“she didn’t pass the math exam”可知，珍妮伤心是因为她没有通过数学考试，所以此处使用because。故选A。 【点睛】本题考查的是连词的用法，because后接表示原因的句子，例如：I went to school late because I got up late. 句中I got up late是原因，I went to school late是结果。 39．Many of the older buildings in Tianjin look beautiful________workers have carefully made them look as good as new. A．while B．if C．although D．because 【答案】D 【详解】句意：天津许多老建筑看起来很漂亮，因为工人们精心地把它们做得和新的一样漂亮。 考查连词。while当……的时候；if如果；although尽管；because因为。后文的句子“workers have carefully made them look as good as new.”是前文的句子“Many of the older buildings in Tianjin look beautiful”的原因，因此用because引导。故选D。 40．Linda was just going out shopping________the telephone rang. A．while B．when C．after D．because 【答案】B 【详解】句意：当电话铃响时，琳达正要出去购物。 考查连词辨析。while当……时候；强调主从句同时发生，只表示在一段时间内的延续行为状态； when当……的时候；连接从句表示某时刻或一段时间，既在某个点上；after在……之后；because因为；根据“the telephone rang.”可知，在特定的时间点上电话响了，用when引导的时间状语从句。根据题意，故选B。 二、完成句子(本大题共10小题，每小题2分，共20分) 41．既然没有人看到，我拒绝相信你。 nobody saw it, I you. 【答案】 Since refused to trust/believe 【详解】对比中英文，英语句中缺少“既然”和“拒绝相信”。第一空为since引导的原因状语从句，表示显然的、已知的理由，since“既然”，位于句首，首字母大写；refuse to do sth“拒绝做某事”，根据第一句中的“saw”，用一般过去时，动词用过去式refused；believe/trust“相信”。故填Since；refused；to；trust/believe。 42．既然这个项目很有价值，为何不尽快开展呢？ Why don’t you ? 【答案】carry out the project as soon as possible since it is of great value 【详解】why don’t you do sth“你为什么不做某事”，carry out“开展”， the project“这个项目”，as soon as possible“尽快”，since“既然” ，be of great value“很有价值”；根据汉意可知，since引导的原因状语从句为一般现在时，主语为it，be动词用is。故填carry out the project as soon as possible since it is of great value。 43．既然你已经完成了家庭作业，你就可以打篮球了。 you have finished your homework, you can play basketball. 【答案】Now that 【详解】空处缺少“既然”的表达，用now that/since表示，两者都可引导时间状语从句，但是now that常用于句首，since则常用于句中，故填Now that。 44．我们推荐丹尼儿是因为他能使所有东西保持井然有序。 We recommend Daniel . 【答案】because he can keep everything in order 【详解】because因为，是一个连词，引导原因状语从句，主语为he，谓语动词是can keep；keep…in order是一个固定短语，井然有序；everything所有东西，作宾语。 45．因为太多的工作，昨天晚上我妈妈不得不熬夜。 Last night, my mother stay up late too much work. 【答案】 had to because of/because she had/because she did 【详解】根据“Last night”可知用一般过去时。不得不have to；因为太多的工作because of too much work/because she had too much work/because she did too much work。故填had to；because of/because she had/because she did。 46．她不开心是因为她上学迟到了。 She was unhappy she was late school. 【答案】 because for 【详解】第一处表示“因为”，可用连词because引导原因状语从句；第二处构成“be late for”短语，意为“迟到”。故填because；for。 47．由于虚拟现实科技，人们不必亲临其境即可游览国内外名胜。 of VR technology, people can places of interest both at home and abroad instead of going there in person. 【答案】 Because visit 【详解】根据中英文对照可知，这里缺的是“由于”和“游览”，英语中“由于”也就是“因为”，所以可以说成是because，“游览”也就是“参观”，英语是visit，且空格前有情态动词can，所以这里应该用动词原形，故答案为Because，visit。 48．既然汽车坏了，就什么都做不了了。 the car broke down, nothing . 【答案】 Since could be done 【详解】根据汉语可知，空一是“既然，since”引导原因状语从句，首字母s大写；空二的动词“做，do”和主语“nothing”之间是被动关系，根据汉语应用情态动词can的被动语态，其构成形式为can be done；结合从句一般过去时态可知，主句也应用一般过去时的被动语态，can的过去式could；do的过去分词是done。故填Since；could be done。 49．因为Jim犯的错误比其他任何一个学生少，所以老师表扬了他。 The teacher praised Jim . 【答案】because he made fewer mistakes than any other student 【详解】because“因为”，引导原因状语从句；he“他”，作主语，指代Jim；make fewer mistakes“犯更少的错误”，fewer修饰可数名词复数；than“比”；any other student“其他任何一个学生”，any other修饰可数名词单数；根据“praised”可知，时态是一般过去时，谓语动词make变为过去式made。故填because he made fewer mistakes than any other student。 50．Lily和她妈妈都对这个沙发不满意，因为它占据了太多的空间。 too much space. 【答案】Neither Lily nor her mother is satisfied with the sofa because it takes up/Both Lily and her mother are not satisfied with the sofa because it takes up 【详解】此句为原因状语从句，描述事实用一般现在时。对照中英文可知，缺少“Lily和她妈妈都对这个沙发不满意，因为它占据了”。“Lily和她妈妈都”用both Lily and her mother，或者“两者都不……”用neither…nor…，遵循“就近原则”，“Lily和她妈妈都不……”用neither Lily nor her mother，位于句首首字母大写；“对……满意”用be satisfied with sth.，用both…and…短语时，be动词用are，“对……不满意”用are not satisfied with sth.；用neither…nor…短语时“her mother”决定了be动词用is；“这个沙发”用the sofa；“因为”用because，引导原因状语从句；“它”用it，主格作主语；“占据”用take up，主语为第三人称单数的it，谓语动词用三单形式的takes up。故填Neither Lily nor her mother is satisfied with the sofa because it takes up/Both Lily and her mother are not satisfied with the sofa because it takes up。 试卷第1页，共3页 试卷第1页，共3页 学科网（北京）股份有限公司 $$ 班级 姓名 学号 分数 Unit 5 Art world 原因状语从句 （时间：60分钟，满分：100分） 原因状语从句（Adverbial Clause of Reason）用于说明主句动作或状态发生的原因，由特定的从属连词引导。它是英语中表达因果逻辑的核心结构之一，能使句子更丰富、逻辑更清晰。 一、核心引导词及用法对比 从属连词 语气强弱 位置特点 例句解析 because ★★★最强（直接原因） 可放主句前（用逗号隔开）或后 Because it rained heavily, the match was canceled. （因为下大雨，比赛取消了 → 强调直接原因） He failed because he didn’t study.（他因没学习而失败） since ★★☆较强（已知原因） 多放句首，表“既然” Since you’re tired, rest now. （既然你累了，现在休息吧 → 原因双方已知） as ★☆☆较弱（附带说明） 多放句首 As it was getting dark, we went home. （天色渐晚，我们回家了 → 原因非重点） for ★☆☆最弱（补充原因） 只能放主句后，前加逗号 She must be ill, for she looks pale. （她一定病了，因为她脸色苍白 → 补充推断依据） 重点区别： because 回答 “Why?”（强因果） — Why was the match canceled? — Because it rained. since/as 常用于已知背景（≈ “鉴于”） for 是并列连词（非从属连词），表推断依据（≈ “由于”），不用于句首。 二、位置与标点规则 1. 从句在前：用逗号与主句隔开 Because he was late, he missed the bus. As she forgot her keys, she couldn’t enter. 2. 从句在后：通常不加逗号（for除外） He missed the bus because he was late. She couldn’t enter as she forgot her keys. ✅ It must be snowing, for it’s so cold.（for前必须加逗号） 三、易错点及避坑指南 1. because 与 so 不能连用！ ❌ Because he was tired, so he left early. （错误！） ✅ Because he was tired, he left early. ✅ He was tired, so he left early. 2. since/as 避免与“自从”混淆 原因：Since you know it, tell me. （既然你知道，告诉我吧） 时间：He has changed since he moved here. （自从搬来后他变了） 3. for 不能替换直接强原因 ❌ He failed for he didn’t study. （语义弱，不自然） ✅ He failed because he didn’t study. 1、 单项选择(本大题共40小题，每小题2分，共80分) 1．David had to stay in the hospital ________ he hurt his head. A．or B．so C．but D．because 2．Fish can only live in the water ________ there are cats on the shore (岸)! A．and B．although C．but D．because 3．Tony never spends any money in buying book, _________ he doesn’t like reading. A．so B．because C．although D．because of 4．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 5．—Dad, could I have more chocolate? —You’d better not ________ too much sweet food is harmful to your health. A．if B．before C．though D．because 6．People often give me fans as presents __________ they know I like them. A．because B．while C．so D．before 7．—Look, there are more and more electric cars driving along the street. —Yeah. They are a big hit _________ they produce less air pollution. A．unless B．though C．but D．because 8．My phone bill is high ________ I have lots of friends and we like to talk on the phone. A．or B．so C．but D．because 9．—Did Alice write back to Mr. Smith? —She didn’t have to, ________ she’ll visit him tomorrow. A．though B．unless C．when D．because 10．We didn’t enjoy the holiday ________ the weather was so awful. A．though B．if C．unless D．because 11．________ you know little about this art form, you can find a book to learn. A．Though B．While C．When D．Since 12．He didn’t go to school ________ he was ill. A．so B．because C．or D．so that 13．I always get up early on weekdays ________ I’m afraid I will be late for school. A．though B．because of C．so D．because 14．_________ you are free today, could you help me with housework? A．Since B．Though C．Unless D．Until 15．We all like our Chinese teacher _________ she is kind and patient. A．unless B．though C．whether D．because 16．—Tony, who is your favourite writer? —Mark Twain. I like him _________ he wrote many interesting stories. A．or B．so C．but D．because 17．John lost his way in the field, ________ the ground was covered with thick snow. A．or B．for C．but D．so 18．It’s hard for us to say goodbye _________ we have so many happy days to remember. A．unless B．because C．until D．although 19．—The local food may taste a little strange. —Well, ________ we are here, why not give it a try? A．though B．although C．since D．because 20．—Hi, Mike! Would you like to fly kites with me? —I’d like to go but I can’t, ________ I have to finish my question survey first. A．because B．until C．so D．while 21．The family had to stay at the hotel ________ it was raining hard. A．although B．because C．until D．unless 22．Our school holds a reading festival on April 8th every year ________ it can encourage students to read more books. A．although B．because C．unless D．until 23．I love going to school ________ everyone in my class is friendly. A．before B．although C．because D．unless 24．She had to stop running ________ she hurt her left knee in the sports meeting. A．because B．so C．but D．although 25．Many wild animals don’t have a safe place to live, ________ villages and farms are growing bigger and taking away their land. A．because B．until C．although D．before 26．—Mum, may I have more chocolate? —You’d better not ________ too much sweet food is bad for health. A．until B．while C．although D．because 27．The day must be breaking, ________ the birds have begun singing. A．because B．as C．for D．since 28．________ all the passengers are here, why don’t we start at once? A．As soon as B．After C．Now that D．When 29．—The light in his room is still on. Do you know why he stays up so late? — _______  prepare for the coming exam. A．In order that B．So that C．In order to D．Because 30．She didn’t send the e-mail yesterday _________ it was too late. A．if B．after C．before D．because 31．—Have you returned Helen’s call? —I don’t need to ________ I’ll see her tomorrow. A．if B．unless C．so D．because 32．It’s easy to find a good bookshop in our city ________ we have many ones here. A．because B．so C．though D．when 33．In China, we always use red paper for Hongbao ________ red means luck. A．until B．if C．although D．because 34．Poor Kate didn’t go to school today ________ she hurt her leg. A．so that B．if C．before D．because 35．_______ China is growing stronger and stronger, Chinese is taught in more and more countries. A．If B．Unless C．As D．Although 36．My father came back late last night _________ his car broke down on the way. A．so B．because C．but D．although 37．We did not have fun on the day _________ the weather was too cold. A．or B．because C．but D．so 38．—Jenny was sad ________ she didn’t pass the math exam. —Let’s cheer her up. A．because B．and C．but D．if 39．Many of the older buildings in Tianjin look beautiful________workers have carefully made them look as good as new. A．while B．if C．although D．because 40．Linda was just going out shopping________the telephone rang. A．while B．when C．after D．because 二、完成句子(本大题共10小题，每小题2分，共20分) 41．既然没有人看到，我拒绝相信你。 nobody saw it, I you. 42．既然这个项目很有价值，为何不尽快开展呢？ Why don’t you ? 43．既然你已经完成了家庭作业，你就可以打篮球了。 you have finished your homework, you can play basketball. 44．我们推荐丹尼儿是因为他能使所有东西保持井然有序。 We recommend Daniel . 45．因为太多的工作，昨天晚上我妈妈不得不熬夜。 Last night, my mother stay up late too much work. 46．她不开心是因为她上学迟到了。 She was unhappy she was late school. 47．由于虚拟现实科技，人们不必亲临其境即可游览国内外名胜。 of VR technology, people can places of interest both at home and abroad instead of going there in person. 48．既然汽车坏了，就什么都做不了了。 the car broke down, nothing . 49．因为Jim犯的错误比其他任何一个学生少，所以老师表扬了他。 The teacher praised Jim . 50．Lily和她妈妈都对这个沙发不满意，因为它占据了太多的空间。 too much space. 试卷第1页，共3页 试卷第1页，共3页 学科网（北京）股份有限公司 $$