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I won't tell the student the answer to the math problem until he on it for more

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I won't tell the student the answer to the math problem until he on it for more

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

试题答案

A

标签：untilproblemmathiton

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