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问题: 语法综合练习7

Sales of CD's have greatly increased since the early 1990s, when
people ______ to enjoy the advantage of this new technology.
A. begin B. began C. have begun D.had begun
请详细写出解题的过程和思路。

解答:

这句话的意思应该是:从90年代早期人们开始享受新技术的好处,CD的销量大大增加.时间上是过去了的,只叙述了一个简单事实,所以用一般过去,即答案B.