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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 中等
  • 浏览 294

The old man __________ in Tibet for two years as a volunteer teacher;it is an experience he  often mentions.

A.served B.serves C.is serving D.has served
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TheoldmaninTibetfortwoyearsasa