问题: 一道选择题
---Must I come here at four o'clock?
---Oh,no,you______.
A.mustn't B.don't C.can't D.don't have to
解答:
选D
用must提问，肯定回答用Yes,you must.
否定回答一般用needn't，比如:No, you needn't
或者用don't have to，比如：No, you don't have to.
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