用needn't.
例句：Must I return the book tomorrow?no,you needn't.
记住知识点：回答must引出的问句时,如果答案是否定的回答,不能用 mustn't ,而要用needn't或don't have to.
希望回答能够帮助你.
谁知道must做“必须”讲时 反义疑问句用needn't 还是mustn't
1个回答
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