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    精英家教网 > 高中英语 > 题目详情
    --Haven't you seen Mr. Wilson at the lecture?
    --Yes, but he had left _________ I could ask him any questions.
    A．whenB．beforeC．afterD．as
    B

    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.
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