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(2011·江西高考)It ________be the postman at the door.It's only six o'clock.
A.mustn'tB.can't
C.won'tD.needn't
B
选B 考查情态动词。句意:门口不可能是邮递员,(现在)才六点钟。 对现在的否定推测,由It's only six o'clock.分析可知应用can't(不可能)。mustn't“禁止”, won't“不会”,needn't“不必”,均不合句意。
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