Unit4 Grammar预习检测1. Please hold on to your dream _ one day it comes true.A. ifB. untilC. unlessD. though2.Always look around _ you cross the street, David.OK. I know, Mom.A. untilB. beforeC. unless3._ I got back, I found my mother cooking for me.A. WhenB. BeforeC. SinceD. Although4. Youd better make a good plan _ you take a holiday.A. beforeB. duringC. untilD. after5.Jimmy, its time to go to bed.Oh, I wont do that _ I finish my homework.A. ifB. untilC. afterD. when6.The local living conditions (条件) have improved a lot _ China set up the city of Sansha.And more and more people would like to go there for business.A. beforeB. whenC. sinceD. after7. Amy was reading a book _ I came in.A. whenB. whileC. becauseD. though8. Ill probably stay with my friends _ I get my own place to live in.A. beforeB. whenC. afterD. because参考答案及解析1. B 考查连词的用法。if意为“如果”；until意为“直到为止”；unless意为“除 非”；though意为“虽然”。句意为“请坚守你的梦想，直到有一天梦想成真”，故选B。2. B 考查连词的用法。until意思是“直到为止”，引导时间状语从句，before表示 “在之前”，unless表示“除非”。根据句意，故答案为B。3. A 考查状语从句的连词辨析。When当的时候；Before在 之前；Since自从，由于；Although虽然。根据句意，故选A。4. A 考查连词的用法辨析。before在之前；during在期间；until直到为止；after在之后。句意为“在你去度假之前，你最好制订一个好计划5. B 考查连词的用法。根据上句可以判断本句句意为“噢，完成作业之前我不会上床睡觉”。6. C 考查从属连词的辨析。“since+般过去时的句子”是现在完成时的标志词，根据“The local living conditions (条件）have improved a lot”可以判断用since，所以选择答案C。7. A 考查时间状语从句的引导词。because因为；though尽管，虽然；while引导的时间状语从句通常用进行时态，表示主句的动作发生的同时，从句的动作也正在发生；when当的时候，常用来引导时间状语从句。根据句意，所以选择答案A。8. A 考查连词的用法。A项表示“在以前”，B项表示“当的时候”，C项表示“在之后”，D项表示“因为”。根据句意“在我有自己的地方住之前，我很可能和我的朋友们住在一起。”可知，本题选A。