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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．began?
    C．have begunD．had begun?
    B?
    此题考查since以及定语从句的时态照应。since加过去时间点，主句自然用完成时态。既然since跟的是过去的时间点，那么when指代的当然就是过去时间in the early 1990s，所以选过去式began。
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