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单选题
51.一The window is dirty.一I know. It for weeks.
A
A. hasn * t cleaned
B
B. didn＇t clean
C
C. wasn * t cleaned
D
D. hasn * t been cleaned
答案解析
正确答案：D
解析：
51.【翻译】——窗户很脏：——我知道：已经有几周没有人擦了：【精析】D根据句中的is, know和答句中的时间状语for weeks可知，答句的第二句应用现在完成时，表示过去的 某一动作或行为一直持续到现在，而且还有可能延续下去，另外，根据句意可知.It （window）和clean之间是逻辑上 的动宾关系，所以应用被动语态。故选D .
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