题目内容
I won’t tell the student the answer to the math problem until he ________ on it for more than an hour.
| A.has been working | B.will have worked | C.will have been working | D.had worked |
A
解析
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题目内容
I won’t tell the student the answer to the math problem until he ________ on it for more than an hour.
| A.has been working | B.will have worked | C.will have been working | D.had worked |
A
解析