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【題目】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

【答案】B

【解析】

句意：自從20世紀90年代初人們開始享受這項新技術的好處以來，CDs的銷量大大增加�？疾闀r態(tài)辨析題。本句是關系副詞when引導的定語從句，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，與現在無關，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。根據句意結構，可知選B。

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