Do you have to buy this hatA.mustn't B.won't C.needn't D.don't need选哪个?为什么?

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Do you have to buy this hat
A.mustn't B.won't C.needn't D.don't need
选哪个?为什么?

选C
have to 问句的否定回答是need not 这是固定的啊
比如说Must的否定回答也是need not 啊

选C;
mustn't表示“不准,不允许”;
won't表示“不会,不打算”;
根据句意“你非得买这个帽子吗?”,回答是“不是”;
而C和D都表示“我不需要”,再由句法结构应选情态动词,所以选C