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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 began

D.

had began

答案:B
解析:

该题中when引导的是一个非限制性定语从句,且when指代前面的the early 1990s,显然是过去的一个具体时间,所以用一般过去时态。


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