题目
题型：不详难度：来源：
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 |
答案
解析
核心考点
试题【.By the time he comes back, I’m sure we ________ all these rooms of the lab. The】；主要考察你对名词等知识点的理解。[详细]
举一反三
______the zoologists tried to prove was that the photo of the South China Tiger had been staged or technologically dealt with.
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| A．Until | B．By the time | C．Unless | D．After |
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| A．Created | B．Creating | C．To create | D．To be created |
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