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题型：单选题题类：模拟题难易度：普通

You have already tried your best, so you _____worry too much about the exams.

A、can't B、needn't C、mustn't D、shouldn't

举一反三

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

—Must I finish my homework now, Mom?
—No, you _______.You can do it tomorrow.

——Must I do the rest of the work today?
——No. You _________ finish it tomorrow.

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

—Must I give the dictionary back to the library now?

—No, You _______. You can _______ it for another two weeks.

﹣ Mom, ______ I visit the art museum next Monday?

﹣ I'm afraid you can't. All museums in the city are closed on Monday.

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