— ________ I return the book to the library today?—No, you ________. You may keep it for another three days.A.Can; can'tB.Must; don't have toC.May; can'tD.Must; mustn't
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B解析问句用must提问时,答句表示肯定回答,用Yes, you must;若表示否定回答,则常用No, you don't have to,相当于No, you needn't.