Your paper ____(must,hand)in as soon as the bell___(ring) 怎么填

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Your paper ____(must,hand)in as soon as the bell___(ring) 怎么填

must be handed .rings

must be handed in rings

must be handed (被动语态) rings(一般现在时,表示现在进行时(将来))

Your paper _mast be handed___(must,hand)in as soon as the bell__rings_(ring).
只要钟一响,你的试卷得马上交了。

must be handed . rings