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 begun          D. had begun

B


解析:

本題考時態(tài)和句子結(jié)構(gòu)。句中when是關(guān)系副詞，引導定語從句，修飾the early 1990s。從句的意思是：當時（指in the early 1990s）人們開始喜歡這一新科技帶來的好處。講的是過去發(fā)生的事，與現(xiàn)在無關(guān)，排除A、C。從句中有表示過去具體時間的狀語（when相當于in the early 1990s），不能用過去完成時。

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