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题文

-May we start the meeting now?
-No, we________ . We__________ to start until the manager comes.

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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