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--The window is dirty.
----I know. It ______ for weeks.
A.hasn’t cleanedB.didn’t clean
C.wasn’t cleanedD.hasn’t been cleaned
D

试题分析:考查时态和语态。句意:—窗户很脏。—我知道。已经几个星期没有洗了。根据句子的时间状语for weeks可知与完成时连用,在根据句意说明使用被动语态。故D正确。
点评:时态题的考查关键是抓住句子的上下文含义和句中的时间状语。要根据时间状语来选择合适的时态,在平时的学习中要注意积累有关时态的用法和各种时态的特殊之处。如since, so far等经常与现在完成时连用。在条件状语从句中用一般现在时代替将来时等等。
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