题目内容

---Must I clean the room right now?
---No, you . You clean it after lunch.

B
回答must开头的一般疑问句，如果是否定的回答，要用needn't或don't have to，表示“不必”“没有必要”的意思，而不用mustn't，因为mustn't表示禁止或不许，意思是“一定不要”的意思。

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