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  • 科目:英语
  • 题型:单选题
  • 难度:中等
  • 人气:1425

— Why do you do volunteer work in the North—West?
— I_____ to improve the lives of the children there through my efforts.

A.was trying B.have tried
C.am trying D.tried
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—WhydoyoudovolunteerworkintheN