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—Can we leave the classroom now? —No, you _________. You _________ to leave until the bell rings. A....
题目内容:
—Can we leave the classroom now?
—No, you _________. You _________ to leave until the bell rings.
A. don’t have to; are supposed B. mustn’t; are allowed
C. needn’t; aren’t allowed D. can’t; aren’t supposed
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