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题型：单选题题类：常考题难易度：普通

I _____ ask my father to give up smoking. It's bad for his lungs.

A、must B、need C、shouldn't

举一反三

— Is that Mr. Green?
— Impossible. He has gone to America. It be him.

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

The clothes need _________, but you _________do that by yourselves.

When you have classes, you ________ listen to the teacher carefully.

— I swim here?

—I'm sorry. Children swim alone here.

—Must I stay here with you?

—No, you . You may go home, but you go to the net bar(网吧).

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