Unit 7 The unknown world 语法Grammar 原因状语从句-2024-2025学年八年级英语下册单元重难点易错题精练（沪教牛津版）

Unit 7 The unknown world 原因状语从句 （时间：40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．—Tom, pass me the glasses ________ I can’t see the words clearly. —Here you are. A．so B．since C．though 【答案】B 【详解】句意：——汤姆，把眼镜递给我，因为我看不清楚上面的字。——给你。 考查连词辨析。so所以；since因为；though尽管。根据“I can’t see the words clearly.”可知，因为看不清，所以需要眼镜，要用since引导原因状语从句。故选B。 2．—Why does the little girl feel upset?     —________ her pet dog died. A．Because B．Because of C．Thanks to 【答案】A 【详解】句意：——为什么小女孩感到难过？——因为她的宠物狗死了。 考查连词用法。Because因为，连词，后接句子；Because of因为，介词短语，后接名词/代词；Thanks to由于，幸亏，多用于积极语境。根据“her pet dog died”可知是完整句子，需用连词引导原因状语从句。故选A。 3．—Tom, don’t eat too much ice cream ________ it’s not good for your health. —OK, mum. I won’t. A．so B．because C．but 【答案】B 【详解】句意：——汤姆，不要吃太多冰淇淋，因为这对你的健康不好。——好的，妈妈。我不会的。 考查连词用法。so所以；because因为；but但是。根据“don’t eat too much ice cream ... it’s not good for your health”可知，前后句之间是因果关系，前果后因，应该用because。故选B。 4．I’m afraid I can’t go with you _________ I have to look after my sick sister at home. A．and B．but C．so D．because 【答案】D 【详解】句意：恐怕我不能和你一起去，因为我得在家照顾生病的妹妹。 考查连词辨析。and和；but但是；so因此；because因为。根据“I’m afraid I can’t go with you”及“I have to look after my sick sister at home.”可知，空格后解释不能去的原因，故选D。 5．________ 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。 6．Jason didn’t go to the concert _________ he had too much homework to do. A．because B．so C．until D．although 【答案】A 【详解】句意：Jason没去听音乐会，因为他有太多的作业要做。 考查连词辨析。because因为；so所以；until直到……为止；although尽管。根据“Jason didn’t go to the concert… he had too much homework to do.”可知，太多的家庭作业要做是他没有去听音乐会的原因，应用because引导原因状语从句。故选A。 7．I will not tell you the rules _______ I have told you before. A．because B．because of C．until D．while 【答案】A 【详解】句意：我不会告诉你规则，因为我以前告诉过你。 考查连词辨析。because因为，后接从句；because of因为，后接名词性短语；until直到；while当……时。“I have told you before”是“I will not tell you the rules”的原因，且空格后接的是句子，故选A。 8．Mary must be ill at home _______ she didn’t come to school today. A．when B．because of C．but D．because 【答案】D 【详解】句意：玛丽一定是病在家里，因为她今天没来上学。 考查连词辨析。when当……时；because of因为，后接名词、代词等；but但是；because因为，后接句子。分析句子可知，玛丽因为没来上学，所以推测她一定是病了，后句表原因，故用because引导状语从句。故选D。 9．Li Ming didn’t go to school ________ he had the flu. A．because B．and C．so D．but 【答案】A 【详解】句意：李明没去上学，因为他得了流感。 考查连词辨析。because因为；and和；so所以；but但是。分析句子关系可知“he had the flu”是李明没去上学的原因，因此用“because”。故选A。 10．—Is Tommy a top student? —Yes. He always gets good grades ________ he works so hard. A．if B．so C．but D．because 【答案】D 【详解】句意：——汤米是优等生吗？——是的。他总是取得好成绩因为他学习那么认真。 考查连词辨析。if如果；so所以；but但是；because因为。根据“He always gets good grades ... he works so hard.”可知他学习刻苦取得好成绩，所以空后一句是空前一句的原因。故选D。 11．I dare not go out alone at night ________ I am afraid. A．because B．if C．until D．so 【答案】A 【详解】句意：我晚上不敢一个人出去，因为我害怕。 考查连词辨析。because因为；if如果；until直到；so因此。“I am afraid”是“I dare not go out alone at night”的原因，用because引导原因状语从句。故选A。 12．—The local food may taste a bit strange. —Well, ___________ we’ve here, why not give it a try? A．though B．unless C．since 【答案】C 【详解】句意：——当地的食物可能尝起来有一点奇怪。——好吧，既然我们来到这里，为什么不试一试呢？ 考查连词辨析。though虽然；unless除非；since既然。答者提议尝试当地的食物，由此推断，空格处用“since”表原因，意为“既然”。故选C。 13．I like English ________ English is very important. A．but B．or C．so D．because 【答案】D 【详解】句意：我喜欢英语，因为英语很重要。 考查连词辨析。but但是；or或者；so所以；because因为。根据前后两句的逻辑，可知此处表示原因，应该用because引导原因状语从句，故选D。 14．He didn’t go to school yesterday　　 　he was ill. A．although B．if C．because 【答案】C 【详解】句意：他昨天没有去学校，因为他病了。 考查连词辨析。although虽然；if如果；because因为。根据前后句含义，“他生病了”这件事是“他没有去上学”的原因，二者存在因果关系。故选C。 15．I’m dreaming of a white Christmas ________ it never snows in winter in my hometown. A．or B．because C．if 【答案】B 【详解】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。 16．—Is everyone here today? —No. Tom is at home ______ he has got a bad cold. A．because B．if C．until 【答案】A 【详解】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。 17．—I didn’t see Lily at the party last night. —Well, she didn’t go there ________ she was feeling sick. A．and B．until C．though D．because 【答案】D 【详解】句意：——昨晚聚会上我没看见莉莉。——好吧，她没有去那里，因为她觉得不舒服。 考查连词辨析。and和；until直到；though虽然；because因为。“她觉得不舒服”是“她没有去那里”的原因，用because引导原因状语从句。故选D。 18．The course of life never runs smoothly ________ it is full of ups and downs. A．though B．since C．unless D．while 【答案】B 【详解】句意：人生的道路从来都不是一帆风顺的，因为它充满了起起落落。 考查连词辨析。though虽然，尽管，引导让步状语从句；since因为，既然，引导原因状语从句；unless除非，引导条件状语从句；while当……时候，然而，引导时间状语从句或表示对比。根据“The course of life never runs smoothly ... it is full of ups and downs.”可知，“人生充满起起落落”是“人生道路不顺利”的原因，所以用since引导原因状语从句。故选B。 19．Penguins often stand close together ________ it’s very cold in their living place. A．so B．but C．because D．and 【答案】C 【详解】句意：企鹅经常站得很近，因为它们生活的地方很冷。 考查连词辨析。so所以；but但是；because因为；and和。根据“Penguins often stand close together…it’s very cold in their living place.”可知，前后句子是因果关系，应该用because引导原因状语从句。故选C。 20．I like dolphins very much _______ they are cute and clever. A．but B．when C．or D．because 【答案】D 【详解】句意：我非常喜欢海豚，因为它们又可爱又聪明。 考查连词。but但是；when当……时；or或者；because因为。根据“I like dolphins very much…they are cute and clever.”可知前后是因果关系，故选D。 21．—Why are you late for class? —________ my alarm clock didn’t go off this morning. A．So B．Because C．However D．Unless 【答案】B 【详解】句意：——你为什么上课迟到？——因为我的闹钟今天早上没有响。 考查连词辨析。so所以；because因为；however然而；unless除非。根据“Why are you late for class?”可知此处回答原因，用because。故选B。 22．Most of the students have prepared to try their best ________ they are in Grade Nine. A．unless B．until C．since 【答案】C 【详解】句意：大多数学生都已经准备好尽他们最大的努力，因为他们九年级了。 考查连词辨析。unless除非，表示条件关系；until直到，表示时间关系；since自从，表示时间或原因关系。分析句子结构可知，本句为原因状语从句，根据句意可知，大多数学生都已经准备好尽他们最大的努力，是因为他们九年级了，所以应用since引导原因状语从句。故选C。 23．—John, ________ we’ve got a few minutes to wait for the meal, let’s read the poem To Wang Lun. —OK, Mom. A．since B．though C．until D．before 【答案】A 【详解】句意：——约翰，既然我们还有几分钟时间等餐，让我们读一下《赠汪伦》这首诗吧。 ——好的，妈妈。 考查从属连词辨析。since由于，既然；though虽然，尽管；until直到……为止；before在……之前。根据“we’ve got a few minutes to wait for the meal, let’s read the poem To Wang Lun.”可知，前后句之间表达的是因果关系，因此用since引导原因状语从句。故选A。 24．—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 【详解】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。 25．—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。 26．I think my pet dog is very smart ________ it can open the door and carry things for me. A．so B．although C．because 【答案】C 【详解】句意：我认为我的宠物狗很聪明，因为它能为我开门和搬运东西。 考查连词辨析。so所以；although虽然；because因为。根据“I think my pet dog is very smart ... it can open the door and carry things for me.”可知，后句是前句的原因，因此用because引导原因状语从句。故选C。 27．Our family would like to buy electric cars ________ they produce less air pollution. A．because B．so C．but D．and 【答案】A 【详解】句意：我们家想买电动汽车，因为它们产生的空气污染少。 考查连词辨析。because因为；so所以；but但是；and和。根据“Our family would like to buy electric cars…they produce less air pollution.”可知，后句是前句的原因，因此此处用“because”来连接。故选A。 28．Lily didn’t know how to deal with the trouble ________ she couldn’t speak French. A．though B．because C．unless D．if 【答案】B 【详解】句意：Lily不知道如何处理这些麻烦，因为她不会说法语。 考查连词辨析。though尽管；because因为；unless除非；if如果。根据“Lily didn’t know how to deal with the trouble...she couldn’t speak French.”可知，前后句为因果关系。故选B。 29．_________ everybody is here now, let’s begin our meeting. A．With B．For C．If D．Since 【答案】D 【详解】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。 30．I want to buy something special for my grandmother, _______ her birthday is coming. A．because B．although C．so 【答案】A 【详解】句意：我想给我奶奶买点特别的东西，因为她的生日快到了。 考查连词。because因为；although虽然；so因此；空格前后句之间是因果关系，属于“前果后因”结构，应用because引导原因状语从句，故选A。 二、完成句子(本大题共10小题，每小题4分，共40分) 31．既然天气很糟糕，为何不推迟运动会? the weather is bad, why not put off the sports meet? 【答案】 Now that 【详解】既然：now that，从属连词。故填Now；that。 32．Tom didn’t go to school yesterday because he caught a bad cold. (改为同义句) Tom didn’t go to school his bad cold. 【答案】 because of 【详解】句意：Tom昨天没有去上学因为他得了重感冒。原句是because引导的原因状语从句，可以换成because of加名词短语，故填because；of。 33．He was absent from school yesterday because of his illness.（改为复合句） He was absent from school yesterday he . 【答案】 because was ill 【详解】句意：他昨天因病缺课了。此处可改为because引导的原因状语从句，从句用一般过去时，主语是he，be动词用was，表语是形容词ill“生病的”。故填because；was；ill。 34．Wang Mei didn’t come to school yesterday because she was ill.（改为同义句） Wang Mei didn’t come to school yesterday of her . 【答案】 because illness 【详解】句意：王梅昨天没来上学，因为她病了。原句中是because引导原因状语从句，也可以用because of+名词性短语替换。第二空前为形容词性物主代词her，故第二空应该填名词，ill的名词为illness“疾病”。故填because；illness。 35．露西昨天缺席了会议，因为她的车抛锚了。 Lucy yesterday. 【答案】was absent from the meeting because her car broke down 【详解】“缺席”be absent from；“会议”the meeting；“因为”because；“她的车”her car；“抛锚”break down。根据“yesterday”可知用一般过去时。故填was absent from the meeting because her car broke down。 36．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。 37．hands, the, are, they, up, questions, to, because, ask, want, students’（连词成句） . 【答案】The students’ hands are up because they want to ask questions 【详解】根据所给标点可知，此句为陈述句。because引导原因状语从句，the students’ hands作主句的主语；are up是系表结构；they作从句的主语；want to do sth“想要做某事”：ask questions“问问题”，故填The students’ hands are up because they want to ask questions“学生们举起了手，因为他们想问问题”。 38．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。 39．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。 40．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。 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 $$ Unit 7 The unknown world 原因状语从句 （时间：40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．—Tom, pass me the glasses ________ I can’t see the words clearly. —Here you are. A．so B．since C．though 2．—Why does the little girl feel upset?     —________ her pet dog died. A．Because B．Because of C．Thanks to 3．—Tom, don’t eat too much ice cream ________ it’s not good for your health. —OK, mum. I won’t. A．so B．because C．but 4．I’m afraid I can’t go with you _________ I have to look after my sick sister at home. A．and B．but C．so D．because 5．________ you’re free today, you’d better relax yourself in the forest. A．Though B．Because C．Since D．For 6．Jason didn’t go to the concert _________ he had too much homework to do. A．because B．so C．until D．although 7．I will not tell you the rules _______ I have told you before. A．because B．because of C．until D．while 8．Mary must be ill at home _______ she didn’t come to school today. A．when B．because of C．but D．because 9．Li Ming didn’t go to school ________ he had the flu. A．because B．and C．so D．but 10．—Is Tommy a top student? —Yes. He always gets good grades ________ he works so hard. A．if B．so C．but D．because 11．I dare not go out alone at night ________ I am afraid. A．because B．if C．until D．so 12．—The local food may taste a bit strange. —Well, ___________ we’ve here, why not give it a try? A．though B．unless C．since 13．I like English ________ English is very important. A．but B．or C．so D．because 14．He didn’t go to school yesterday　　 　he was ill. A．although B．if C．because 15．I’m dreaming of a white Christmas ________ it never snows in winter in my hometown. A．or B．because C．if 16．—Is everyone here today? —No. Tom is at home ______ he has got a bad cold. A．because B．if C．until 17．—I didn’t see Lily at the party last night. —Well, she didn’t go there ________ she was feeling sick. A．and B．until C．though D．because 18．The course of life never runs smoothly ________ it is full of ups and downs. A．though B．since C．unless D．while 19．Penguins often stand close together ________ it’s very cold in their living place. A．so B．but C．because D．and 20．I like dolphins very much _______ they are cute and clever. A．but B．when C．or D．because 21．—Why are you late for class? —________ my alarm clock didn’t go off this morning. A．So B．Because C．However D．Unless 22．Most of the students have prepared to try their best ________ they are in Grade Nine. A．unless B．until C．since 23．—John, ________ we’ve got a few minutes to wait for the meal, let’s read the poem To Wang Lun. —OK, Mom. A．since B．though C．until D．before 24．—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 25．—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 26．I think my pet dog is very smart ________ it can open the door and carry things for me. A．so B．although C．because 27．Our family would like to buy electric cars ________ they produce less air pollution. A．because B．so C．but D．and 28．Lily didn’t know how to deal with the trouble ________ she couldn’t speak French. A．though B．because C．unless D．if 29．_________ everybody is here now, let’s begin our meeting. A．With B．For C．If D．Since 30．I want to buy something special for my grandmother, _______ her birthday is coming. A．because B．although C．so 二、完成句子(本大题共10小题，每小题4分，共40分) 31．既然天气很糟糕，为何不推迟运动会? the weather is bad, why not put off the sports meet? 32．Tom didn’t go to school yesterday because he caught a bad cold. (改为同义句) Tom didn’t go to school his bad cold. 33．He was absent from school yesterday because of his illness.（改为复合句） He was absent from school yesterday he . 34．Wang Mei didn’t come to school yesterday because she was ill.（改为同义句） Wang Mei didn’t come to school yesterday of her . 35．露西昨天缺席了会议，因为她的车抛锚了。 Lucy yesterday. 36．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. 37．hands, the, are, they, up, questions, to, because, ask, want, students’（连词成句） . 38．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. 39．既然没有人看到，我拒绝相信你。 nobody saw it, I you. 40．John talk shows they’re enjoyable. 约翰想看访谈节目，因为它们令人愉快。 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 $$