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    精英家教网 > 高中英语 > 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
    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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