— 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.

题型：单选题题类：常考题难易度：普通

— 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、must, may not B、will, won't C、may, mustn't D、may, can't

举一反三

—It __________ be him. He has gone to Lanzhou.

—Terrible, and it be an uncomfortable journey.

—No, it be him. I saw him off at the airport half an hour ago.

—Sorry, I'm afraid you ________. Look at the sign "No swimming".

—Yes, surely you___.

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