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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

─ Look, Stella is there!
─ That ______ be her. She doesn't like singing.

—______ you read the words in English?
—No, I can't. They are too difficult for me.

It's raining heavily all day, so we ________ stay at home.

— Look! Mr. Lee is standing under the tree.

— It ______ him. He has gone to Canada for his holiday.

We ________pay to get into the concert. It's free.

According to the rule, used batteries _____ be dropped in the red bin for harmful wastes.

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