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    精英家教网 > 高中英语 > 题目详情
    It ___ be the postman at the door. It’s only six o’clock.
    A．mustn’tB．can’tC．won’tD．needn’t
    B

    这题考查情态动词的用法：can’t是表示猜测，不可能，句意是：现在不可能是邮递员，才6点。选B。
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