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— _______ we clean the classroom at once?   — No, you _______. You _______ clean it after school.

A.Must; needn’t; may B.Must; mustn’t; can. C.Shall; can’t; must D.Need; mustn’t; may
科目 英语   题型 单选题   难度 较难
知识点: 情态动词的被动语态
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