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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、can't; aren't allowed C、don't have to; are allowed D、needn't; aren't allowed

举一反三

—Do you have any plans for tonight?—Yes , I____ at the new Italian restaurant in town.

—Who's singing in the garden?—It ________ be Tom. He always practices singing at this time.

- Let's go climbing, shall we?

- You______ be joking! Don't you know I'm afraid of high places?

Nathan likes his job because he enjoy the beauty of nature.

Old people should _______ to politely.

—Must I hand in my composition today?

—No, you_________. You may give it to me tomorrow.

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