题目内容

— The window must have taken you quite a lot of time that day.
— Right. They____ for weeks.
A．haven’t been cleaned B．hadn’t been cleaned
C．didn’t cleanD．haven’t cleaned
B
考查时态。句意：那天擦窗户一定花了你很长时间吧。是的，他们已经好几周没擦了。must have taken表示的是对去事情肯定的推测，在这之前发生的动作应用过去完成时态。所以选B。
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