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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 容易
  • 浏览 1354

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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.

A.have cleaned B.will be cleaning
C.will have cleaned D.have been cleaning
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.Bythetimehecomesback,I’msurew