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    精英家教网 > 高中英语 > 题目详情
    He was about to make a call to Tom _____ Tom patted me on the shoulder.
    A．asB．untilC．whileD．when
    D

    试题分析：考查连词，A. as当…时候B. until直到…C. while当…时候D. when当…时候，句子意思“当汤姆拍我的肩膀的时候他将要给汤姆打电话”，所以选D，when所引导的从句，其谓语动词即可是持续动词，也可是短暂动词；谓语动词动作发生的时间可以与主句谓语动词的动作是同时、或之前、之后；while句中的谓语动词是持续动词，不用短暂动词，位于动作发生的时间通常与主句谓语动词动作发生时间是同时；as侧重指从句的动作与主句的动作同时进行，谓语动词可以是持续性动词，也可以是短暂性动词
    点评：连词是高考常考内容，本题不同的词意思相同，但是它们有区别，要求考生掌握它们的区别
    即学即练：We need some more facts and figures __________ we take the final decision.
    A. since           B. before            C. after            D. until
    选B
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