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题型：单选题题类：常考题难易度：普通

—Look! The man at the gate ______ be our headmaster. He is always standing there every morning.
—No, it ______be him. He is holding a meeting in the office now.

A、must, can't B、must, mustn't C、can't, can't D、can't, mustn't

举一反三

—How is your father going to Naning?
—I'm not sure. He _____ drive there.

— What do you want to eat for lunch? I will prepare it earlier today.
— You_____, mum. Let's go out to have something different.

—Mum, must I wash the dishes right now?

—No, you _________.

—Can I walk across the road now, Mum?

—No, you ________. You have to wait until the lights turn green.

Could you please ________the rubbish here?

—Wow, another gift! What's in the box?

—I'm not sure. It ________ be a pair of sports shoes.

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