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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 中等
  • 浏览 1747

She _________the sign language before she served as a volunteer to help the deaf.

A.learns B.has learned
C.was learning D.had learned
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Shethesignlanguagebeforesheser