. Sales of CDs have greatly increased since the early 1990s, when people ________ to enjoy the advan

题目简介

. Sales of CDs have greatly increased since the early 1990s, when people ________ to enjoy the advan

题目详情

. Sales of CDs have greatly increased since the early 1990s, when people ________ to enjoy the advantages of this new technology.
A.beginB.beganC.have begunD.had begun
题型:单选题难度:偏易来源:不详

答案

B
  when引导的是一个非限制性定语从句,when指20世纪90年代初,当然用一般过去时。

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