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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 中等
  • 浏览 1140

They were walking along the shore ______ a huge wave appeared out of nowhere, sweeping
them out to sea.

A.as B.while C.when D.though
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Theywerewalkingalongtheshoreah