题目内容
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By the time he comes back, I’m sure we ________ all these rooms of the lab. Therefore, he doesn’t have to return.
By the time he comes back, I’m sure we ________ all these rooms of the lab. Therefore, he doesn’t have to return.
| A.have cleaned | B.will be cleaning |
| C.will have cleaned | D.have been cleaning |
C
略
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