问题补充：
-----The windows must have taken you quite a long time that day.
------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：可联系答.案.网客服索取。
