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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 中等
  • 浏览 1881

During the flood many students volunteered ________ through the weekend, giving out food and water for the victims.

A.working B.to work
C.to have worked D.having worked
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Duringthefloodmanystudentsvolu