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题型：单选题题类：常考题难易度：容易

——The sports shoes must be Linda's.
——No, they _____ be. They're too small for her.

A、mustn't B、can't C、may not D、might not

举一反三

——Must I work out the problem right now?
——Yes, you _______. It's very serious.

— 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.

You take me to the station. My brother's taking me.

We'll _________ move to new apartments very soon!

The bamboo forests are becoming smaller. As a result, pandas not have a place to live or food to eat.

—Is Mr. Smith over there?

—It ______ be him. He has gone to Beijing on vacation.

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