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    精英家教网 > 高中英语 > 题目详情
    Jack doesn’t smoke now, but he ______ for almost twenty years.
    A．smokedB．was smokingC．has smokedD．had smoked
    A

    试题分析：考查时态。本题特别容易错选C项。考生会根据for twenty years认为现在现在完成时。实际上本题与前句的now形成对比。句意：Jack现在不抽烟。但是他以前抽了几乎20年。是对以前发生的事情的描述，故使用过去时。
    点评：本题的时态是构成一个对比的关系，是现在与过去的对比，所以前半句使用现在时，后半句使用过去时。
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