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。