题目内容
| — 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 |
| B |
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题目内容
| — 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 |
| B |