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-----Ido my homework now?--No,you--------ACan mustn't B Must

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-----Ido my homework now?--No,you--------ACan mustn't B Must needn't
B must 必须 needn't 不必
再问: 请问能告诉我A为什么不对呢?非常感谢!
再答: A主要是后面的mustn't(表示禁止)不对 — May / Can / Could I ...? 表示请求允许 — Yes, you can. / Sure. Certainly. / Of course (you can). / Go ahead, please. / That’s OK. 否定回答-No, you can’t./ No, I’m afraid not....