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— The window is dirty.

— I know. It ______ for weeks.

A. hasn’t cleaned       B. didn’t clean       C. wasn’t cleaned      D. hasn’t been cleaned

D


解析:

根据题意,窗户就被擦,应该用被动语态,所以排除A、B两C、D两项是全是被动语态,但时态不一致。一般过去进和现在完成时的区别恰恰是中学生的一项难点。一般过去时表示过去某一时间所发生的动作或存在 的状态,对现在无任何影响;而现在完成时跨在两个时间之上,一是过去,一是现在。它的动作发生在过去,但对现在有影响,而这种影响却往往是说话者的关注所在,所以这个意义上的现在完成时一般后面不加时间状语。如:I have finished reading this book ,so I can return it.另外,现在完成时还表示一个动作或行为开始于过去,持续到现在甚至到将来,本用法就是该题所考查的内容。即窗户从过去某一时间以现在一直未擦过,所以很脏。

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