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    精英家教网 > 高中英语 > 题目详情
    —Why is the house in a mess?
    —I         it for Christmas since three days ago.
    A．cleanedB．cleans
    C．have cleanedD．have been cleaning
    D

    试题分析：句意：--为什么房子那么乱？--为了圣诞节我已经打扫三天了。由题干上下文中可知，“我已打扫三天了”，但是还没有打扫完，还要继续打扫，应该用现在完成进行时。现在完成进行时用于表示“从过去某一时刻开始的动作一直持续到现在，并且还要继续下去”。而现在完成时表示过去发生的动作对现在造成的影响好结果。因此，D正确。
    考点: 考查动词时态的用法。
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