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  • 科目:英语
  • 题型:单选题
  • 难度:中等
  • 人气:1061

—— It was           great fun to be a volunteer, wasn't it?
—— Yes. That's         experience hard to forget.

A.a; an B./; an C./; the D.a; the
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——Itwasgreatfuntobeavolunteer,