Sales of CDs have greatly increased since the early 1990s, when people______to e

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问题 Sales of CDs have greatly increased since the early 1990s, when people______to enjoy the advantages of this new technology.

选项 A、begin
B、began
C、have begun
D、had begun

答案 B

解析本题考查动词的时态。分析句子结构可知，when引导时间状语从句，根据时间标志词the early 1990s并结合句意判断，从句谓语动词用一般过去时，因此B为正确选项。

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