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题型：单选题题类：常考题难易度：普通

May we leave the classroom now? No, you _____. You_____ to leave until the bell rings.

A、mustn't, are allowed B、don't have to , are supposed C、needn't , aren't allowed D、can't , aren't supposed

举一反三

—Must I finish the homework tonight?
—No, you .You can finish it tomorrow.

Can you {#blank#}1{#/blank#} (take) these books to Miss Li?

—Must they clean the classroom now?

—No, they ______.

Mum says that you can go out to play with your friends if your homework .

—I think Mr Zhang may be in his office.

—No, he ________ be there. I saw him ________ just now.

Robert must be in the reading room. (改为否定句)

Robert {#blank#}1{#/blank#} {#blank#}2{#/blank#} in the reading room.

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