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— There’s somebody 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’t             B. will, won’t             C. may, mustn’t       D. must, may not

九年级英语单项填空困难题

少年,再来一题如何?
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