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问题

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
正确答案是:
同类题型

Lina didn’t get there on time because ofthe bad weather, what’s more, her car was in poor .

_____is it that is troubling Mary —-Working out the maths problem..

We offered him our congratulation ____his passing the entrance exam.

Last night Ted was late for the party again.—You know, ______.[ ]

How long have you lived in this village— I was ten years old.

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