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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．beginB．began?
C．have begunD．had begun?
B?
此題考查since以及定語從句的時態(tài)照應。since加過去時間點，主句自然用完成時態(tài)。既然since跟的是過去的時間點，那么when指代的當然就是過去時間in the early 1990s，所以選過去式began。
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