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    精英家教网 > 高中英语 > 题目详情
    (2011·江西)It ________ be the postman at the door.It's only six o'clock.
    A．mustn'tB．can'tC．won'tD．needn't
    B
    　根据It's only six o'clock推知，那不可能是邮递员，否定形式推测要用can't或couldn't。因为must表推测时，只能用于肯定句。
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