難度：★ 考點：情態動詞
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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