【題目】---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 cleaned
D.haven't cleaned

【答案】B
【解析】窗戶是被擦干凈，所以用被動(dòng)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(shí)間，--對(duì)，它們幾個(gè)星期沒(méi)擦了。因?yàn)槟翘觳吝^(guò)了，所以用過(guò)去完成時(shí)。選B。

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