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题型：单选题题类：常考题难易度：容易

— Whose is this blue bike?
—It ________ be Mary's. Her bike is black and white.

A、must B、can't C、can D、mustn't

举一反三

——What about going swimming this afternoon?

——You ______ be joking! Don't you know I'm afraid of water?

——Is the man over there Mr. Brown?
——It ______ him. He has gone to Brazil to watch the 2014 FIFA World Cup.

—Look at the black hat. It must belong to Mr. King.

—No, it _______ be his. I saw an old man put it here just now.

Boys and girls, you ______ talk in class, or you will miss something important.

Finish your homework first, then you'll ______watch TV for an hour.

People ______ drive after drinking because it's dangerous.

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