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