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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 中等
  • 浏览 172

It is written clearly in the requirements that all passengers        check onto board thirty minutes before the plane takes off.

A.may B.can C.will D.shall
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Itiswrittenclearlyintherequire