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    精英家教网 > 高中英语 > 题目详情
    ----- The windows must have taken you quite a long time that day.
    ----- Right. They ______ for months.
    A．haven’t been cleanedB．didn’t cleanC．hadn’t been cleanedD．haven’t cleaned
    C
    考查时态。根据must have taken可知是过去的某个时间擦窗户的，那么窗户很久没有被擦是在这之前，所以使用过去完成时。句意：—那些窗户一定花了你很长时间吧！—是的。他们已经好几个月没有被擦了。
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