Unit 8 Imagine that! 单元语法（原因状语从句）-2025-2026学年八年级英语下学期单元重难点易错题精练（沪教版）

Unit 8 Imagine that! 原因状语从句 （时间：40分钟，满分：100分） 原因状语从句 because 因为 直接加未知的原因，语气最强，常用来回答 why 引起的提问 It was because he was late that he didn’t go with us. as 因为；由于 语气最弱，常放于主句前，较口语化，所表达的原因比较明显 As you are a child, you can’t drive a car. since 既然 语气较弱，常放于主句前，表示对方已知的事实 Since he can't answer this question, you’d better ask someone else. for 因为 表示推断的理由是对前面分句加以解释，只能后置 Amy went to bed early, for she didn’t feel well. 【注意】 若强调原因状语从句，只能用 because 引导 一、单项选择(本大题共30小题，每小题2分，共60分) 1．We must protect the redwood forests ________ they are home to many animals. A．or B．because C．but 【答案】B 【详解】句意：我们必须保护红杉林，因为它们是许多动物的家园。 考查连词辨析。or或者；because 因为；but 但是。根据“We must protect the redwood forests...they are home to many animals.”可知，后半句“它们是许多动物的家园”是前半句“我们必须保护红杉林”的原因，因此应选用表示因果关系的连词because。故选B。 2．We all like Mrs. Wang _________ she is very knowledgeable and patient. A．because B．but C．so D．or 【答案】A 【详解】句意：我们都喜欢王老师，因为她知识渊博且有耐心。 考查连词辨析。because因为；but但是；so所以；or或者。根据“We all like Mrs. Wang...she is very knowledgeable and patient.”可知，“她知识渊博且有耐心”是“我们都喜欢她”的原因，前后为因果关系，需用表示原因的连词because。故选A。 3．________ no one else saw the UFO, no one believed his story. A．Because B．Since C．As 【答案】B 【详解】句意：既然没有其他人看到不明飞行物，也就没有人相信他的故事。 考查连词辨析。Because因为；Since既然；As由于。根据“no one else saw the UFO”和“no one believed his story”可知，前后句是因果关系，三个单词都可以引导原因状语从句，但since表显而易见的原因，常置于句首，最符合语境，故选B。 4．We visited Rome ________ we wanted to learn about the history there. A．if B．or C．so D．because 【答案】D 【详解】句意：我们参观了罗马，因为我们想了解那里的历史。 考查连词辨析。if如果；or或者；so因此；because因为。分析句子结构可知，参观罗马的原因是“想了解那里的历史”，前后句之间为因果关系，且后句是前句的原因，此处应用because引导原因状语从句。故选D。 5．________ we have a few minutes to wait for the train, let’s have a cup of coffee. A．Since B．Although C．Before 【答案】A 【详解】句意：既然我们还有几分钟时间等火车，咱们去喝杯咖啡吧。 考查连词辨析。Since既然；Although尽管；Before在……之前。根据“let’s have a cup of coffee”可知去喝咖啡是因为要等几分钟火车，用since引导原因状语从句。故选A。 6．We have to stay at home all day ________ the rain. A．because B．so C．but D．because of 【答案】D 【详解】句意：因为下雨我们不得不全天都待在家里。 考查连词词义辨析。because因为；so因此；but但是；because of因为。我们全天待在家是因为下雨了。又因为because后接句子，because of是一个复合介词，其后接名词、代词、动名词等。“the rain”是一个名词，故应用because of。故选D。 7．I never go out alone at night _______ I am afraid. A．because B．if C．until 【答案】A 【详解】句意：在夜间我从不独自出去，因为我害怕。 考查原因状语从句。because“因为”，引导原因状语从句；if“如果”，引导条件状语从句；until“直到”，引导时间状语从句。根据句意可知，因为我害怕，所以夜间我不独自出去，用because引导原因状语从句。故选A。 8．—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。 9．I don’t understand what you say, ________ you speak too quickly. A．if B．though C．because D．and 【答案】C 【详解】句意：我听不懂你说的话，因为你说得太快了。 考查从属连词辨析。if如果；though虽然；because因为；and并且。分析两句话之间的逻辑，可知后句是前句的原因，应该用because引导原因状语从句，故选C。 10．Now many parents send their children to foreign countries, ________ they want them to get a better education. A．until B．though C．because D．while 【答案】C 【详解】句意：现在许多父母把他们的孩子送到国外，因为他们想让他们得到更好的教育。 考查连词辨析。until直到；though虽然；because因为；while当……时。“they want them to get a better education”是“Now many parents send their children to foreign countries”的原因，用because引导原因状语从句，故选C。 11．—Why didn’t Jack take part in the sports meet? —________ he was ill. A．As B．Since C．For D．Because 【答案】D 【详解】句意：——为什么杰克不参加运动会？——因为他病了。 考查从属连词辨析。As由于；Since既然；For因为；Because因为。根据上文“Why didn’t Jack take part in the sports meet”询问原因，可知此处用because表直接原因，回答why提问的句子，引导原因状语从句，故选D。 12．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。 13．The family have to stay at the hotel________it is raining hard. A．and B．but C．because D．or 【答案】C 【详解】句意：因为雨下得很大，这家人不得不呆在旅馆里。 考查连词辨析。and和；but但是；because因为；or或者。空后“雨下得很大”是空前“不得不呆在旅馆”的原因，所以此空填because引导原因状语从句，故选C。 14．______ Clark likes animals a lot, _______ he goes to the zoo on Saturday. A．So; / B．Because; so C．Because of; / D．Because; / 【答案】D 【详解】句意：因为克拉克非常喜欢动物，所以他在周六去动物园。 考查连词辨析。So所以；Because因为，连接句子；Because of因为，连接名词、代词、动名词。分析句子可知，前后两句构成因果关系，英文中的关联词只能二选一，前句是原因，故选D。 15．He didn't fly to Beijing not ________ the time but________ he was ill. A．because of; because B．because; because C．because; because of D．because of; because of 【答案】A 【详解】句意：他没有乘飞机去北京，不是因为没有时间而是因为他生病了。 考查because和because of的区别。not…but…不是……而是……；because和because of均可表示原因，because of后加名词（短语）、代词或动名词等；because引导原因状语从句，后加句子。第一空后“the time”为名词短语，用becaue of；第二空后面为句子，用because，故选A。 【点睛】because是连词，其后接原因状语从句或回答以why开头的问句；而because of是复合介词，其后接名词、代词或动名词或者what引导的名词性从句。 16．—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 【详解】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。 17．Peter was late for the meeting _________ he missed the ferry. A．though B．because C．while D．if 【答案】B 【详解】句意：彼得开会迟到了，因为他错过了渡船。 考查连词辨析。though尽管；because因为；while当……时候；if如果。根据空前后“Peter was late for the meeting”和“he missed the ferry”可知，因为彼得错过了渡船，所以他开会迟到了，空前后是因果关系，所以这里用because引导原因状语从句。故选B。 18．— Did you return Ted's call? — I did not need to________I will see him tomorrow. A．though B．unless C．because D．when 【答案】C 【详解】句意：——你回Ted的电话了吗？——我不需要回电话因为我明天就会见到他。 考查连词辨析。though尽管，虽然；unless除非，如果不；because因为；when当……时候。根据句意可知，空后的这句话是解释“I did not need to…”的原因，应用because引导原因状语从句。故选C。 19．The match was so boring __________ no one scored at all. A．and B．because C．but D．or 【答案】B 【详解】句意：这场比赛很无聊，因为没有人得分。 考查连词辨析。A. and和，表示并列、承接关系；B. because因为，表示原因，引导原因状语从句；C. but但是，表示转折关系；D. or或者，表示选择关系。根据句意可知，no one scored at all“没有人得分”是人们感觉这场比赛很无聊的原因，所以用because连接，故答案为B。 20．Simon didn’t finish his homework yesterday __________ he had a headache. A．when B．so C．if D．because 【答案】D 【详解】句意：西蒙昨天没有完成作业，因为他头痛。 A. when当……时；B. so所以；C. if如果；是否；D. because因为。根据he had a headache.是西蒙没有完成作业的原因，故选D。 21．We can't see electricity ________ it is invisible. A．if B．when C．because D．although 【答案】C 【详解】句意：我们看不见电，因为它是无形的。 本题考查状语从句。if如果，引导条件状语从句；when当……时候，引导时间状语从句；because因为，引导原因状语从句；although尽管，引导让步状语从句。结合句意，前半句表示我们看不见电，后半句表示它是无形的，前后是因果关系，用连词because，故选C。 22．_______ it’s raining outside, we’d better have some indoor activities. A．If B．As C．Although D．While 【答案】B 【详解】句意：因为外面正在下雨，我们最好进行一些室内活动。 本题考查状语从句。If如果，引导条件状语从句；as因为，引导原因状语从句；although尽管，引导让步状语从句；while当……时候，引导时间状语从句。结合句意，外面正在下雨，是我们做室内活动的原因，用连词as。故选B。 23．I didn’t accept his help ________ I wanted to try it myself. A．though B．until C．because D．as soon as 【答案】C 【详解】句意：我没有接受他的帮助因为我想自己尝试一下。though尽管，虽然；until直到…时候；because因为；as soon as一…就…。根据句意可知，空后这句话解释前面这件事的原因，故用because引导原因状语从句，选C。 24．I don’t like physics ______ it’s too difficult for me. A．and B．so C．because 【答案】C 【详解】句意：我不喜欢物理，因为对我来说太难。 考查连词的用法。and和；so因此；because因为。根据“I don’t like physics”的原因是“it’s too difficult for me.”可知，此处应该用because连接。故选C。 25．My friend and I didn't enjoy the film ________ there was a sudden rain. A．if B．because C．that D．although 【答案】B 【详解】句意：我和朋友不喜欢看这部电影，因为突然下雨了。 考查从属连词。if如果；because因为；that那个；although尽管。根据My friend and I didn't enjoy the film与there was a sudden rain.是因果关系，此空是“因为”的意思，应填because，故选B。 26．Our plane didn’t take off on time ________ the weather was bad. A．and B．because C．but D．so 【答案】B 【详解】句意：因为天气很糟糕，所以我们的飞机不能按时起飞。 考查原因状语从句。and和（表示并列和顺承）；because因为（引导原因状语从句）；but但是（表示转折）；so所以（表示因果）。根据句意可知，表示“因为天气糟糕，所以飞机不能按时起飞”。because因为，故选B。 27．John has decided not to eat too much ________ he always has a stomachache. A．if B．because C．when D．until 【答案】B 【详解】句意：约翰决定不吃太多，因为他总是胃痛。 考查连词辨析。if如果，表条件；because因为，表原因；when当……的时候，表时间；until直到，表时间。根据句意语境，可知本句前后是因果关系，故选B。 28．John didn’t buy the coat ________ it was too expensive. A．so B．but C．or D．because 【答案】D 【详解】句意：John没有买这件大衣，因为它太贵了。 考查连词。so因此；but但是；or否则；because因为。根据题意，可知“it was too expensive”是原因，“John didn’t buy the coat”是结果。故选D。 29．I went to school by bus yesterday ________ my bike was broken. A．although B．because C．when D．unless 【答案】B 【详解】句意：我昨天乘公共汽车上学，因为我的自行车坏了。 考查连词辨析。although虽然；because因为；when当……时；unless除非。自行车坏了是乘公交车去上学的原因，用because引导原因状语从句，表原因。故选B。 30．The exam must be very difficult, ________ many students failed. A．though B．so C．for D．but 【答案】C 【详解】句意：这次考试一定很难，因为许多学生都没有通过。 考查连词辨析。though尽管；So所以；for因为；but但是。根据“The exam must be very difficult”可知，是根据后一句推测出“这次考试一定很难”，因此后一句是前一句的原因，故选C。 二、完成句子(本大题共10小题，每小题4分，共40分) 31．因为他很专业而且总是鼓励我们。 he is very and always us. 【答案】 Because professional encourages 【详解】根据中英文对照可知，空处缺“因为”、“专业的”和“鼓励”。Because“因为”，用于引导原因状语从句；professional“专业的”，形容词，在句中作表语；encourage“鼓励”，主语是“he”（第三人称单数），且句子是一般现在时，所以动词用第三人称单数形式“encourages”。故填Because；professional；encourages。 32．我经常去艺术馆，因为我喜欢绘画。 I go to the art museum I like painting. 【答案】 often because 【详解】对照中英文可知，第一空缺乏中文部分是“经常”，其英文表达是“often”，作时间状语；第二空缺乏的中文部分是“因为”，其英文表达为“because”，后接原因状语从句。故填often；because。 33．You are an adult. You should not ask your parents for money. (保持原句意思) you are an adult, you should not ask your parents for money. 【答案】 Now that 【详解】句意：你是一名成年人了，你不应该问你的父母要钱。前后句子是因果关系，表示“因为”可以用“now that”。故填Now；that。 34．These workers had to stop working, because the rain was too heavy. (同义句转化) These workers had to stop working the heavy rain. 【答案】 because of 【详解】句意：这些工人不得不停止工作，因为雨太大了。原句为because引导的原因状语从句，改为同义句用“because of+名词词组”表达原因，the heavy rain“大雨”，是名词词组。故填because；of。 35．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。 36．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。 37．“哪儿不舒服？”“我真的很累，因为我昨晚学习到午夜。” — ? —I’m really tired I midnight last night. 【答案】 What’s wrong/What’s the matter because studied until 【详解】根据汉语提示，询问对方“哪儿不舒服”，英文表示为“What’s wrong”或者“What’s the matter”；答句中，“因为”，英文表示为because，引导原因状语从句；I是主语，后接动词作谓语，根据last night，可知句子使用一般过去时，study是动词，意为“学习”，until可作介词，意为“直到”。故填What’s wrong/What’s the matter；because；studied until。 38．Carlson didn’t come to the party. He was busy.（合并为一句） Carlson didn’t come to the party he was busy. 【答案】because 【详解】句意：Carlson没有来参加派对。他很忙。“忙碌”是没有来派对的原因，用because引导原因状语从句，故填because。 39．既然这个项目很有价值，为何不尽快开展呢？ Why don’t you it is of great value? 【答案】carry out the project as soon as possible since 【详解】carry out“开展”，Why don’t you后跟动词原形；the project“这个项目”；as soon as possible“尽快”；since“既然”，引导原因状语从句。故填carry out the project as soon as possible since。 40．I like cats. They are cute. (合并为一句) I like cats they are cute. 【答案】because 【详解】句意：我喜欢猫。它们很可爱。分析题干可知，“They are cute.”是“I like cats.”的原因，即：因为猫很可爱，所以我喜欢它们，用because“因为”引导原因状语从句。故填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 8 Imagine that! 原因状语从句 （时间：40分钟，满分：100分） 原因状语从句 because 因为 直接加未知的原因，语气最强，常用来回答 why 引起的提问 It was because he was late that he didn’t go with us. as 因为；由于 语气最弱，常放于主句前，较口语化，所表达的原因比较明显 As you are a child, you can’t drive a car. since 既然 语气较弱，常放于主句前，表示对方已知的事实 Since he can't answer this question, you’d better ask someone else. for 因为 表示推断的理由是对前面分句加以解释，只能后置 Amy went to bed early, for she didn’t feel well. 【注意】 若强调原因状语从句，只能用 because 引导 一、单项选择(本大题共30小题，每小题2分，共60分) 1．We must protect the redwood forests ________ they are home to many animals. A．or B．because C．but 2．We all like Mrs. Wang _________ she is very knowledgeable and patient. A．because B．but C．so D．or 3．________ no one else saw the UFO, no one believed his story. A．Because B．Since C．As 4．We visited Rome ________ we wanted to learn about the history there. A．if B．or C．so D．because 5．________ we have a few minutes to wait for the train, let’s have a cup of coffee. A．Since B．Although C．Before 6．We have to stay at home all day ________ the rain. A．because B．so C．but D．because of 7．I never go out alone at night _______ I am afraid. A．because B．if C．until 8．—The local food may taste a bit strange. —Well, ___________ we’ve here, why not give it a try? A．though B．unless C．since 9．I don’t understand what you say, ________ you speak too quickly. A．if B．though C．because D．and 10．Now many parents send their children to foreign countries, ________ they want them to get a better education. A．until B．though C．because D．while 11．—Why didn’t Jack take part in the sports meet? —________ he was ill. A．As B．Since C．For D．Because 12．He didn’t go to school yesterday　　 　he was ill. A．although B．if C．because 13．The family have to stay at the hotel________it is raining hard. A．and B．but C．because D．or 14．______ Clark likes animals a lot, _______ he goes to the zoo on Saturday. A．So; / B．Because; so C．Because of; / D．Because; / 15．He didn't fly to Beijing not ________ the time but________ he was ill. A．because of; because B．because; because C．because; because of D．because of; because of 16．—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 17．Peter was late for the meeting _________ he missed the ferry. A．though B．because C．while D．if 18．— Did you return Ted's call? — I did not need to________I will see him tomorrow. A．though B．unless C．because D．when 19．The match was so boring __________ no one scored at all. A．and B．because C．but D．or 20．Simon didn’t finish his homework yesterday __________ he had a headache. A．when B．so C．if D．because 21．We can't see electricity ________ it is invisible. A．if B．when C．because D．although 22．_______ it’s raining outside, we’d better have some indoor activities. A．If B．As C．Although D．While 23．I didn’t accept his help ________ I wanted to try it myself. A．though B．until C．because D．as soon as 24．I don’t like physics ______ it’s too difficult for me. A．and B．so C．because 25．My friend and I didn't enjoy the film ________ there was a sudden rain. A．if B．because C．that D．although 26．Our plane didn’t take off on time ________ the weather was bad. A．and B．because C．but D．so 27．John has decided not to eat too much ________ he always has a stomachache. A．if B．because C．when D．until 28．John didn’t buy the coat ________ it was too expensive. A．so B．but C．or D．because 29．I went to school by bus yesterday ________ my bike was broken. A．although B．because C．when D．unless 30．The exam must be very difficult, ________ many students failed. A．though B．so C．for D．but 二、完成句子(本大题共10小题，每小题4分，共40分) 31．因为他很专业而且总是鼓励我们。 he is very and always us. 32．我经常去艺术馆，因为我喜欢绘画。 I go to the art museum I like painting. 33．You are an adult. You should not ask your parents for money. (保持原句意思) you are an adult, you should not ask your parents for money. 34．These workers had to stop working, because the rain was too heavy. (同义句转化) These workers had to stop working the heavy rain. 35．John talk shows they’re enjoyable. 约翰想看访谈节目，因为它们令人愉快。 36．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. 37．“哪儿不舒服？”“我真的很累，因为我昨晚学习到午夜。” — ? —I’m really tired I midnight last night. 38．Carlson didn’t come to the party. He was busy.（合并为一句） Carlson didn’t come to the party he was busy. 39．既然这个项目很有价值，为何不尽快开展呢？ Why don’t you it is of great value? 40．I like cats. They are cute. (合并为一句) I like cats they are cute. 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 $