I won't tell the student the answer to the math problem until he _______ on it for an hour.这题里面可以填works吗

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Iwon''ttellthestudenttheanswertothemathproblemuntilhe_______onitforanhour.这题里面可以填works吗Iwon''ttellthes

I won't tell the student the answer to the math problem until he _______ on it for an hour.这题里面可以填works吗
I won't tell the student the answer to the math problem until he _______ on it for an hour.
这题里面可以填works吗

I won't tell the student the answer to the math problem until he _______ on it for an hour.这题里面可以填works吗
可以,答案就是这个.
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不可以,for+一段时间段是现在完成时时的标志,所以一定要用现在完成时

不可以,填 has worked,for加时间用于完成时