【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(jì)90年代初人們開始享受這項(xiàng)新技術(shù)的好處以來，CDs的銷量大大增加。考查時(shí)態(tài)辨析題。本句是關(guān)系副詞when引導(dǎo)的定語從句，修飾the early 1990s。從句的意思是：當(dāng)時(shí)（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(shí)間的狀語（when相當(dāng)于in the early 1990s），不能用過去完成時(shí)。根據(jù)句意結(jié)構(gòu)，可知選B。

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