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---The window must have taken you quite a lot of time that day.
--- You are right. They ________ for weeks.
A.haven’t been cleanedB.hadn’t been cleaned
C.didn’t’ cleanD.haven’t cleaned
B

这题考查时态语态,窗户是被擦干净,所以用被动式,只能在AB之间选,根据句意:--那天擦窗户一定花了你很多时间,--对,它们几个星期没擦了。因为那天擦过了,所以用过去完成时。选B。
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