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    精英家教网 > 高中英语 > 题目详情
    By the time he got up, I ______ for two hours in the factory.
    A．have workedB．workedC．was workingD．had been working
    D

    试题分析：考查时态。本题的关键词是by，该词通常与完成时连用，句意：到他起床的时候，我已经在工厂里工作了两个小时了。他起床使用了过去时got up，我工作两个小时是在此之前，故使用了过去完成进行时的时态。故D正确。
    点评：连词by到…时为止；该词经常与完成时连用，如果后面是现在的时间，句中就使用现在完成时；如果后面是过去的时间，就使用过去完成时；如果后面是将来的时间，就使用将来完成时。
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