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题文

---May 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
科目 英语   题型 单选题   难度 中等
知识点: 情态动词的被动语态
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