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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 中等
  • 浏览 532

—When did you become a volunteer?
—I________in this group since 2008.

A.joined
B.took part
C.have joined
D.have been
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—Whendidyoubecomeavolunteer?—I