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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 中等
  • 浏览 1070

—Have you ever visited the Water Cube?
—Yes. When I served as a volunteer in Beijing, I      it twice.

A.have visited B.visited
C.had visited D.had been visiting
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相关知识点

—HaveyouevervisitedtheWaterCub