题目内容
-The window must have taken you quite a long time that day.
-Right, they ________ for weeks.
[ ]
A.
haven’t been cleaned
B.
didn’t cleaned
C.
hadn’t been cleaned
D.
haven’t cleaned
答案:C
提示:
提示:
|
回答指的是过去的情况,故应用过去完成时。 |
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