---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

這題考查時態(tài)語態(tài)，窗戶是被擦干凈，所以用被動式，只能在AB之間選，根據(jù)句意：--那天擦窗戶一定花了你很多時間，--對，它們幾個星期沒擦了。因為那天擦過了，所以用過去完成時。選B。
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