As the rule says, every student remain seated until their papers are collected.A. can B. mayC. shall

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【题目】As the rule says, every student remain seated until their papers are collected.

A. can B. may

C. shall D. will

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【答案】C

【解析】

考查情态动词。句意：正如规则所说，每个学生都必须坐着直到他们的试卷被收集起来。shall可用于第二/第三人称陈述句中,表示警告/许诺/命令/威胁/规定等语气。此处表示规定，故选C。