◎ 题干
--- There is someone at the door. Who ______ it be? Is it the postman?
--- No, it ________ be him. It’s just seven o’clock. It’s too early.
A.may, can’tB.will, won’tC.may, mustn’tD.must, may not
◎ 答案
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◎ 解析
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◎ 知识点
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