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-May we leave the classroom now? -No, you _______. You _______ to leave until the bell rings. A. can...
题目内容：
-May we leave the classroom now?
-No, you _______. You _______ to leave until the bell rings.
A. can't; are allowed B. mustn't; aren't allowed
C. needn't; are allowed D. needn't; aren't allowed
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