---The window must have taken you quite a lot of time that dayYou are right. They f

问题补充：

---The window must have taken you quite a lot of time that day.

--- You are right. They for weeks.

A. haven’t been cleaned

B. hadn’t been cleaned

C. didn’t’ clean

D. haven’t cleaned

答案：

A. haven’t been cleaned

(答案→)B. hadn’t been cleaned

C. didn’t’ clean

D. haven’t cleaned

解析：

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。