选B
首先被动语态,排除A
其次,must是情态动词,其后要跟动词原形
Our headmaster told us that our classroom was so dirty that it must__clean.
Our headmaster told us that our classroom was so dirty that it must__clean.
A keep B be kept C been kept
A keep B be kept C been kept
英语人气：685 ℃时间：2019-10-19 07:58:33
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