——May we leave the classroom now? ——No, you_____. You____to leave until the bell rings.

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问题 ——May we leave the classroom now? ——No, you_____. You____to leave until the bell rings.

选项 A、mustn’t;are allowed
B、don’t have to;are supposed
C、needn’t;aren’t allowed
D、can’t;aren’t supposed

答案C

解析 问句是以May引导的,故答语不能用B、D项,答话中第二句句意为:“铃响了你们才能离开”,此处用短语“not…until”表示“直到……才”,故C项为正确答案。
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