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. would have worked D. had worked
B
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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. would have worked D. had worked
B