用所给词适当形式填空.When must he ____(finish)doing his homework?

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用所给词适当形式填空.When must he ____(finish)doing his homework?
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用所给词适当形式填空.When must he ____(finish)doing his homework?
用所给词适当形式填空.When must he ____(finish)doing his homework?

用所给词适当形式填空.When must he ____(finish)doing his homework?
finish
情态动词后接动词原形

finish must +动词原形

finish
must情态动词,后面动词用原形