Unit 5 Teamwork 语法Grammar 原因状语从句-2025-2026学年八年级英语上册单元重难点易错题精练（沪教版五四学制2024）

班级 姓名 学号 分数 Unit 5 Teamwork 原因状语从句 （时间：60分钟，满分：100分） 一、单项选择(本大题共30小题，每小题2分，共60分) 1．The children cleaned their rooms quickly, ________ they wanted to go to the park, ________ it began to rain. A．because; but B．for; and C．but; so D．or; yet 【答案】A 【详解】句意：孩子们很快打扫了房间，因为他们想去公园，但是天开始下雨了。 考查连词。because因为；but但是；for由于；and和；so因此；or或者；yet仍然。根据“they wanted to go to the park”可知，后句是一个完整的句子且解释了原因，第一空填because；根据“it began to rain.”可知，语境发生了转折，第二空填but。故选A。 2．The mother is worried about her son, ________ he is at home by himself. A．so B．or C．because 【答案】C 【详解】句意：这位母亲很担心她的儿子，因为他一个人在家。 考查连词辨析。so所以；or或者、否则；because因为。根据“The mother is worried about her son...”及“...he is at home by himself.”可知，前后两句为因果关系，后句是前句的原因。故选C。 3．—Where is Mary now? —She is crying in the bathroom ________ she did badly in the English exam. A．because B．though C．until 【答案】A 【详解】句意：——玛丽现在在哪里？——她在浴室里哭，因为她英语考试考得不好。 考查连词辨析。because因为；though尽管；until直到。根据“She is crying in the bathroom…she did badly in the English exam.”可知，玛丽哭的原因是因为英语考试考得不好，应用because引导原因状语从句。故选A。 4．—I’d like to join the painting club, ________ I do well in drawing. —That’s great! The club needs talented members. A．or B．but C．because D．so 【答案】C 【详解】句意：——我想加入绘画俱乐部，因为我擅长绘画。——太好了！俱乐部需要有才能的会员。 考查连词辨析。or否则；but但是；because因为；so所以。根据“I’d like to join the painting club, … I do well in drawing.”可知，空处前后表示因果关系，前果后因。故选C。 5．________ everyone has arrived, let’s begin our meeting. A．Because B．As C．Since 【答案】C 【详解】句意：既然大家都到了，我们开始开会吧。 考查连词辨析。Because因为，用于直接回答“why”，强调因果关系；As由于，也可表原因，但可能隐含时间上的伴随；Since既然，更正式，多用于既定事实。根据“…everyone has arrived, let’s begin our meeting.”可知，“大家都到了”是既定事实，且主句为提议，此时Since更符合正式语境和常见用法。故选C。 6．Students should eat more fruit and vegetables ________ they are good for health. A．so B．but C．because D．although 【答案】C 【详解】句意：学生应该多吃水果和蔬菜，因为它们对健康有好处。 考查连词辨析。so所以；but但是；because因为；although尽管，虽然。分析前后句可知，前后句“多吃蔬菜和水果”与“它们对健康有好处”表示必然的因果关系，应用because引导原因状语从句。故选C。 7．He never works hard ________ he thinks he’s smarter than others. A．when B．because of C．because D．before 【答案】C 【详解】句意：他从不努力工作，因为他认为自己比别人聪明。 考查连词辨析。when当……时；because of由于；because因为，接句子；before在……之前。根据“he thinks he’s smarter than others.”可知，后文解释了原因，且是句子。故选C。 8．—How was the show last night? —I didn’t enjoy it, ________ the person next to me was too noisy. A．although B．because C．so D．but 【答案】B 【详解】句意：——昨晚的表演怎么样？——我没有能好好的欣赏，因为旁边的人太吵了。 考查连词辨析。although虽然；because因为；so所以；but但是。感觉“the person next to me was too noisy”可知，解释的是原因，用because引导原因状语从句。故选B。 9．John is going to take acting lessons ________ he wants to be an actor in the future. A．because B．but C．though D．so 【答案】A 【详解】句意：约翰打算去上表演课，因为他将来想成为一名演员。 考查连词辨析。because因为；but但是；though尽管；so所以。前后句是因果关系，后句是因，所以用because引导原因状语从句。故选A。 10．—The boy didn’t come to school ________ the bad weather. —No, ________ he was ill. A．because, because of B．because of, because C．because, because D．because of, because of 【答案】B 【详解】句意：——由于糟糕的天气这个男孩今天没有来学校。——不，因为他生病了。 考查because of与because的区别。because是连词，其后接句子；because of后接名词性短语。根据第一空后的“the bad weather”是名词性短语可知，第一空填because of；根据第二空后的“he was ill”是句子可知，第二空填because。故选B。 11．I was so glad to see you ________ I haven’t seen you for three years. A．that B．because C．while 【答案】B 【详解】句意：我很高兴见到你，因为我已经三年没见到你了。 考查连词辨析。that作为连词，引导从句时，没有实际意义；because因为；while与……同时。分析句子结构可知，后句是前句的原因，应用because引导原因状语从句。故选B。 12．—I feel bored and I have no idea of what to do now. —Well. ________ you are so free, you can help me fold the clothes. A．Although B．Until C．Since D．Unless 【答案】C 【详解】句意：——我感到无聊，不知道现在该做什么。——嗯。既然你有空，你可以帮我叠衣服。 考查连词辨析。although虽然；until直到；since既然；unless除非。前后两句是因果关系，此处表示原因，用since引导原因状语从句。故选C。 13．________ we know the importance of saving water, we should take actions as quickly as possible. A．Since B．Until C．Before D．Although 【答案】A 【详解】句意：既然我们知道节约用水的重要性，我们应该尽快采取行动。 考查连词辨析。Since既然；Until直到……才；Before在……之前；Although尽管。分析题干，前句表示人们已知的事实，不需要再强调，应用since引导原因状语从句，意为“既然”知道了，就要采取行动。故选A。 14．_________ nobody can help us, let’s do it on our own. A．For B．As C．Since D．Though 【答案】C 【详解】句意：既然没有人能帮助我们，那我们自己做吧。 考查连词辨析。for因为，语气很弱，常指顺便提及的说明，不能在句首；as因为，常指众所周知的原因，语气较弱；since既然，常用于表明基于某个已知事实的理由；though虽然。根据“nobody can help us, let’s do it on our own.”可知此处是既然没有人帮助，就自己做，此处表示基于某个已知事实的理由，且语气较强，用since引导原因状语从句。故选C。 15．_______ water covers most of the Earth, land is very precious (宝贵的). A．As B．For C．Until D．Since 【答案】A 【详解】句意：由于水覆盖了大部分地球，那么，陆地就十分珍贵了。 考查连词辨析。As由于，指众所周知的原因；For因为，但语气很弱，常指顺便提及的说明，不能在句首；Until直到……才；since既然，表示原因是已知的客观事实，语气略强于as。根据“…water covers most of the Earth”可知，此处是比较明显的原因，应用as引导原因状语从句。故选A。 16．________ you’re free today, you’d better relax yourself in the forest. A．Though B．Because C．Since D．For 【答案】C 【详解】句意：既然你今天有空，你最好到森林里放松一下。 考查连词辨析。Though 虽然；Because因为，表因果关系的语气最强，用来回答why的问句；Since 由于，表已知的事实，无需强调的原因，通常放在句首；for因为，用来作附加说明，为前面的事实提供一种推断的理由。根据“ you’re free today”可知此处用since表对话双方都知道的事实“既然你今天有空”。故选C。 17．I have to stay at home, ________ it’s raining hard. A．but B．so C．or D．because 【答案】D 【详解】句意：我们不得不待在家里，因为外面雨下得很大。 考查连词辨析。but但是，表示转折；so因此，表示因果关系；or或者，表示选择关系；because因为，表示因果关系。根据句意可知，待在家里的原因是因为外面雨下的很大，前后属因果关系，属于“前果后因”的结构，故选D。 18．Mr. Li visits his parents every week ________ he wants to spend more time with them. A．because B．until C．though D．unless 【答案】A 【详解】句意：李先生每周都去看望他的父母，因为他想花更多的时间和他们在一起。 考查连词辨析。because因为；until直到；though尽管；unless除非。空格后“he wants to spend more time with them.”是解释每周都去看望父母的原因，用because引导原因状语从句，故选A。 19．I want to be a teacher in the future _________ I like staying with children. A．when B．before C．with D．because 【答案】D 【详解】句意：我将来想成为一名老师，因为我喜欢和孩子们待在一起。 考查连词辨析。when当……时候；before在……以前；with和；because因为。根据“I want to be a teacher in the future...I like staying with children.”可知，将来想成为一名老师是因为喜欢和孩子们待在一起，应用because引导原因状语从句，故选D。 20．It is hard for us to say goodbye ________ we have so many happy days to remember. A．if B．while C．because D．before 【答案】C 【详解】句意：我们很难说再见，因为我们有许多美好的日子值得回忆。 考查连词。if如果；while当……时候；because因为；before在……之前。根据“we have so many happy days to remember.”可知，前句为果，后句为原因。应用because引导原因状语从句，故选D。 21．I love going to school ________ everyone in my class is friendly. A．or B．but C．before D．because 【答案】D 【详解】句意：我喜欢上学，因为我们班的每个人都很友好。 考查连词辨析。or或者；but但是；before在……之前；because因为。根据题干“I love going to school”（我喜欢上学）及“everyone in my class is friendly”（我们班的每个人都很友好）可知后句是前句的原因。故选D。 22．Tom was late for class _________ his bike was broken on his way to school. A．and B．but C．because D．when 【答案】C 【详解】句意：汤姆上课迟到了，因为他的自行车在上学的路上坏了。 考查连词辨析。and和；but但是；because因为；when当。前后是因果关系，前果后因，用because引导原因状语从句。故选C。 23．If you eat in our restaurant, the juice is all free, _______ today is our shop-establishment celebration. A．although B．until C．because D．when 【答案】C 【详解】句意：如果您在我们餐厅用餐，果汁全部免费，因为今天是我们的店庆。 考查连词辨析。although虽然；until直到……；because因为；when当……时。分析题干可知，“our shop-establishment celebration”是果汁全部免费的原因，故此处为原因状语从句，应用because引导。故选C。 24．—I like rain ________ it makes me feel cool and relaxed. —So do I. A．or B．because C．but 【答案】B 【详解】句意：——我喜欢雨水，因为它使我感到凉爽和放松。 ——我也一样。 考查连词辨析。or否则；because因为；so因此。根据“I like rain...it makes me feel cool and relaxed.”可知前后是因果关系，“it makes me feel cool and relaxed”为原因，所以此处用连词because。故选B。 25．Many people like pandas ______ they are cute. A．though B．if C．because 【答案】C 【详解】句意：很多人喜欢熊猫，因为它们很可爱。 考查连词。though虽然；if如果；because因为。前后两句是因果关系，前果后因，用because引导原因状语从句。故选C。 26．______ you know it, I won’t repeat it. A．As B．Although C．Unless 【答案】A 【详解】句意：因为你知道了，所以我不会再重复。 考查连词辨析。as因为；although虽然；unless除非。“you know it”是“I won’t repeat it”的原因，用as引导原因状语从句。故选A。 27．______ Susan likes children, she can choose to volunteer in a primary school. A．While B．Since C．So 【答案】B 【详解】句意：因为苏珊喜欢孩子，她可以选择去小学做志愿者。 考查连词辨析。While与……同时；Since因为，由于；So因此。根据“... Susan likes children, she can choose to volunteer in a primary school.”可知，前后句为因果关系，前因后果，故用Since引导原因状语从句。故选B。 28．My father didn’t play basketball with me yesterday ________ he was very busy. A．but B．because C．although D．so 【答案】B 【详解】句意：我父亲昨天没有和我一起打篮球，因为他很忙。 考查连词辨析。but但是；because因为；although尽管；so因此。根据“My father didn’t play basketball with me yesterday...he was very busy.”可知，句子前后是因果关系，前果后因，用because连接句子。故选B。 29．________ Alex is too heavy, ________ his mother doesn’t want him to eat too much. A．Although; but B．Although; / C．Because; / D．Because; so 【答案】C 【详解】句意：因为亚历克斯太重了，所以他妈妈不想让他吃太多。 考查连词辨析。Although虽然；but但是；Because因为；so所以。根据“Alex is too heavy”和“his mother doesn’t want him to eat too much.”可知，前后句为因果关系，前因后果，应用because引导原因状语从句，because不与so连用。故选C。 30．________ everybody is here, let’s begin our class. A．Before B．Since C．On the one hand D．Moreover 【答案】B 【详解】句意：既然大家都到了，让我们开始上课吧， 考查词义辨析。before在……之前；since既然、因为；on the one hand一方面；moreover此外。根据“… everybody is here, let’s begin our class.”可知，可以开始上课是因为大家都到了，应用since引导原因状语从句。故选B。 二、完成句子(本大题共10小题，每小题4分，共40分) 31．因为天气炎热，我们玩的不开心。 We didn’t good time it hot. 【答案】 have a because was 【详解】根据题干可知，空①②缺少“玩的(不开心)”，用动词短语have a good time“玩得开心”中的have a表示，位于助动词didn’t后用动词原形；空③缺少“因为”，用连词because表示；空④缺少be动词，主语为it，时态为一般过去时，be动词用was。故填have；a；because；was。 32．我最喜欢狮子，因为它们是动物世界之王。 I like . 【答案】lions because they are the kings of the animal world 【详解】根据汉语提示可知，空处应填复数名词“lions”表示一类事物和一个because引导的原因状语从句，由“它们是动物世界之王”可知，从句中应用“主系表”的结构，它们是“they are”；动物世界之王“the kings of the animal world”。故填lions because they are the kings of the animal world。 33．他一定是病了，因为他今天缺席了。 He must be ill, he is absent today. 【答案】because 【详解】根据中文意思可知，前后存在因果关系，后半句是前半句的原因，用because连接。故填because。 34．玛丽不得不和她的玩具熊分开，因为她的卧室太小了。 Mary has to her toy bear her bedroom is too small. 【答案】 part with because 【详解】根据中文意思可知本题考查短语part with“和……分开”和单词because“因为”，have to“不得不”后续动词原形，而because引导原因状语从句，故填part；with；because。 35．David很幸运，因为他的爱好已经给他带来了快乐和成功。 David is very lucky, . 【答案】because his hobby has brought him pleasure and success 【详解】because“因为”；his hobby“他的爱好”；bring“带来”，此处表示对现在造成影响，应该用现在完成时，主语为第三人称单数，助动词用has，bring的过去分词为brought；he“他”，此处作宾语，应该用宾格him；pleasure and success“快乐和成功”。故填because his hobby has brought him pleasure and success。 36．因为这场雨，我们今天无法在室外打篮球了。 We can’t play basketball outside today the rain. 【答案】because of 【详解】根据英汉对照，缺少“因为”。因为，由于because/because of。空后为名词，用because of。故填because of。 37．John talk shows they’re enjoyable. 约翰想看访谈节目，因为它们令人愉快。 【答案】 wants to watch because 【详解】通过中英文句子的对比可知，英文句子中缺少“想看”和“因为”的表达；want to do sth.“想去做某事”，根据句意可知句子时态是一般现在时，主语John是第三人称单数形式，谓语用第三人称单数形式；watch“观看”；because“因为”；故填wants；to；watch；because。 38．埃米想要保留她的旧东西，因为它们唤起甜蜜的回忆。 Amy wants her old things they sweet memories. 【答案】 to keep because bring back 【详解】根据所给汉语意思可知，应该填的是“保留”和“因为”以及“唤起”，want to do sth“想要做某事”，所以第一个空用动词keep”保留“的不定式to keep作宾语，连词because“因为”，动词短语bring back意为“唤起”，时态是一般现在时，主语“they”是复数，所以用动词原形，故填to keep；because；bring back。 39．埃米想要保留她的旧东西，因为它们唤起甜蜜的回忆。 Amy wants to keep her old things they sweet memories. 【答案】 because bring back 【详解】because“因为”，引导原因状语从句；bring back“唤起”，根据“wants”可知，句子是一般现在时，主语they是复数形式，动词用原形，故填because；bring；back。 40．安娜一年中最喜欢春天，因为那时一切都恢复了生机。 Anna likes spring best in a year because everything comes back to life . 【答案】 at that time 【详解】对照汉语意思，可知英语句子缺少“在那时”的表达。“在那时”常用短语“at that time” ，用于指代前文提到的 “春天的时候” 这一特定时间，符合语境，所以填 at that time。 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 Teamwork 原因状语从句 （时间：60分钟，满分：100分） 一、单项选择(本大题共30小题，每小题2分，共60分) 1．The children cleaned their rooms quickly, ________ they wanted to go to the park, ________ it began to rain. A．because; but B．for; and C．but; so D．or; yet 2．The mother is worried about her son, ________ he is at home by himself. A．so B．or C．because 3．—Where is Mary now? —She is crying in the bathroom ________ she did badly in the English exam. A．because B．though C．until 4．—I’d like to join the painting club, ________ I do well in drawing. —That’s great! The club needs talented members. A．or B．but C．because D．so 5．________ everyone has arrived, let’s begin our meeting. A．Because B．As C．Since 6．Students should eat more fruit and vegetables ________ they are good for health. A．so B．but C．because D．although 7．He never works hard ________ he thinks he’s smarter than others. A．when B．because of C．because D．before 8．—How was the show last night? —I didn’t enjoy it, ________ the person next to me was too noisy. A．although B．because C．so D．but 9．John is going to take acting lessons ________ he wants to be an actor in the future. A．because B．but C．though D．so 10．—The boy didn’t come to school ________ the bad weather. —No, ________ he was ill. A．because, because of B．because of, because C．because, because D．because of, because of 11．I was so glad to see you ________ I haven’t seen you for three years. A．that B．because C．while 12．—I feel bored and I have no idea of what to do now. —Well. ________ you are so free, you can help me fold the clothes. A．Although B．Until C．Since D．Unless 13．________ we know the importance of saving water, we should take actions as quickly as possible. A．Since B．Until C．Before D．Although 14．_________ nobody can help us, let’s do it on our own. A．For B．As C．Since D．Though 15．_______ water covers most of the Earth, land is very precious (宝贵的). A．As B．For C．Until D．Since 16．________ you’re free today, you’d better relax yourself in the forest. A．Though B．Because C．Since D．For 17．I have to stay at home, ________ it’s raining hard. A．but B．so C．or D．because 18．Mr. Li visits his parents every week ________ he wants to spend more time with them. A．because B．until C．though D．unless 19．I want to be a teacher in the future _________ I like staying with children. A．when B．before C．with D．because 20．It is hard for us to say goodbye ________ we have so many happy days to remember. A．if B．while C．because D．before 21．I love going to school ________ everyone in my class is friendly. A．or B．but C．before D．because 22．Tom was late for class _________ his bike was broken on his way to school. A．and B．but C．because D．when 23．If you eat in our restaurant, the juice is all free, _______ today is our shop-establishment celebration. A．although B．until C．because D．when 24．—I like rain ________ it makes me feel cool and relaxed. —So do I. A．or B．because C．but 25．Many people like pandas ______ they are cute. A．though B．if C．because 26．______ you know it, I won’t repeat it. A．As B．Although C．Unless 27．______ Susan likes children, she can choose to volunteer in a primary school. A．While B．Since C．So 28．My father didn’t play basketball with me yesterday ________ he was very busy. A．but B．because C．although D．so 29．________ Alex is too heavy, ________ his mother doesn’t want him to eat too much. A．Although; but B．Although; / C．Because; / D．Because; so 30．________ everybody is here, let’s begin our class. A．Before B．Since C．On the one hand D．Moreover 二、完成句子(本大题共10小题，每小题4分，共40分) 31．因为天气炎热，我们玩的不开心。 We didn’t good time it hot. 32．我最喜欢狮子，因为它们是动物世界之王。 I like . 33．他一定是病了，因为他今天缺席了。 He must be ill, he is absent today. 34．玛丽不得不和她的玩具熊分开，因为她的卧室太小了。 Mary has to her toy bear her bedroom is too small. 35．David很幸运，因为他的爱好已经给他带来了快乐和成功。 David is very lucky, . 36．因为这场雨，我们今天无法在室外打篮球了。 We can’t play basketball outside today the rain. 37．John talk shows they’re enjoyable. 约翰想看访谈节目，因为它们令人愉快。 38．埃米想要保留她的旧东西，因为它们唤起甜蜜的回忆。 Amy wants her old things they sweet memories. 39．埃米想要保留她的旧东西，因为它们唤起甜蜜的回忆。 Amy wants to keep her old things they sweet memories. 40．安娜一年中最喜欢春天，因为那时一切都恢复了生机。 Anna likes spring best in a year because everything comes back to life . 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 $$