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It ________ be the postman at the door.It's only six o'clock.( 2011·江西)
A.mustn'tB.can'tC.won'tD.needn't
D
D [考查虚拟语气。句意:不可能是邮递员在门口,才六点钟呢。mustn't 禁止,不允许;can't 不可能;won't 不愿意,就是不,偏不;needn't 不需要。]
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