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If you miss this chance, it may be years...

If you miss this chance, it may be years __________ you get another one.

A. after      B. when      C. before     D. since

 

C 【解析】 试题分析:考查时间状语从句。ince引导的句子要用一般过去时态,after是“在什么之后”的意思,不符合逻辑, when 引导的句子,从句谓语动词可为延续性动词或非延续性动词,before引导的句子主句谓语动词发生在从句之前,符合本句语境。句意:如果你错过了这次机会,在你得到另一个机会之前可能会有好多年。故选C。 考点:考查时间状语从句。 【名师点睛】 做题时学生应该掌握如何来辨别时间状语中引导词的使用。 1、while, when和as ①as, when 引导短暂性动作的动词. Just as / Just when / When I stopped my car, a man came up to me. ②当从句的动作发生于主句动作之前,只能用when 引导这个从句,不可用as 或 while. When you have finished your work, you may have a rest. ③从句表示"随时间推移"连词能用as,不用when 或while. As the day went on, the weather got worse. 2、until和till ①肯定形式表示的意思是“做某事直至某时”,动词必须是延续性的. I slept until midnight. 我一直睡到半夜时醒了. Wait till I call you. 等着我叫你. 在肯定句中可用before代替. Let's get in the wheat before the sun sets. ②否定形式表达的意思是“直至某时才做某事”.动词为延续性或非延续性都可以 She didn't arrive until 6 o'clock. 她直到6点才到. Don't get off the bus until it has stopped. 公共汽车停稳后再下车. I didn't manage to do it until you had explained how.直到你教我后,我才会做. ③ Until可用于句首,而till通常不用于句首. 3、表示“一…就…”的结构 hardly/scarcely…when/before, no sooner…than和as soon as 都可以表示“一…就…”的意思,例如:As soon as I got home, it began to rain.  
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