---Must I finish the book today?---Yes, you ________, but you ________ finish it now. Have a rest first.A.do; don't have toB.do; mustn'tC.must; don't have toD.must; mustn't
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C解析回答以must开头的疑问句，肯定回答仍用must，否定回答用needn't或don't have to，而不用mustn't．mustn't的意思是“不准，千万不能”，它与have to的否定形式doesn't (don't) have to有很大的差别，后者意为“不必，不一定要”．