— 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
考查時態(tài)。句意：那天擦窗戶一定花了你很長時間吧。是的，他們已經(jīng)好幾周沒擦了。must have taken表示的是對去事情肯定的推測，在這之前發(fā)生的動作應(yīng)用過去完成時態(tài)。所以選B。
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