--Haven"t you seen Mr. Wilson at the lecture? --Yes, but he had left _________
题型：不详难度：来源：
--Haven"t you seen Mr. Wilson at the lecture?
--Yes, but he had left _________ I could ask him any questions.| A．when | B．before | C．after | D．as |
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答案
| B |
解析
试题分析：考查引导词的用法，when 意思“当……时候”，所引导的从句，谓语动词可以是持续的，也可以是短暂性动词，谓语动词发生的时间可以与主句谓语动词的动作是同时的，before意思“在……之前”， after意思“在……之后”，as意思“当……时候”，侧重指从句与主句的动作同时进行，谓语动词可以是持续的，也可以是短暂性动词，句子意思“我将要问问题他就离开了”，所以选B
点评：引导词是常考内容，要知道它们的用法，when 意思“当……时候”，所引导的从句，谓语动词可以是持续的，也可以是短暂性动词，谓语动词发生的时间可以与主句谓语动词的动作是同时的，before意思“在……之前”， after意思“在……之后”，as意思“当……时候”，侧重指从句与主句的动作同时进行，谓语动词可以是持续的，也可以是短暂性动词. |
举一反三
You can"t camp________you like these days. Many natural areas are now under protection.| A．whichever | B．wherever | C．what | D．when |
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food is hard to find, few birds remain throughout the year.| A．Although | B．Where | C．Unless | D．When |
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I remember everything ______it had happened yesterday.| A．in case | B．even if | C．as long as | D．as if |
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If you find yourself ______ no one will help you, please call me.| A．where | B．when | C．which | D．what |
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Scarcely had they settled themselves in their seats in the theatre ______ the curtain went up.| A．then | B．before | C．when | D．then |
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