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 b-高中英语-魔方格

◎ 题干

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

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◎ 解析

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◎ 知识点

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