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　　难度：★    考点：情态动词

　　1. －Mom, must I clean my room now?

　　－No, you          . You can do it tomorrow.

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

　　2. You____________  worry about me. I feel much better now.

　　A. mustn't      B. can't                  C. needn't             D. won't

　　3.You ________ stop when the traffic light turns red.

　　A. can           B. had better         C. need            D. must

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