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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 较易
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27.Sales of CDs have greatly increased since the early 1990s, when people       to enjoy the advantages of this new technology.

A.begin B.began C.have begun D.had begun
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27.SalesofCDshavegreatlyincrea