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It ______ be the postman at the door. It’s only six o’clock.
A.mustn’tB.can’tC.won’tD.needn’t
B
本题考查情态动词的用法。A表示“禁止”;B:不可能;C:不愿意;D:不必。句意:门外不可能是邮递员,现在才六点。根据句意可知答案为B项。
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