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(shí)態(tài)和句子結(jié)構(gòu)。句中when是關(guān)系副詞，引導(dǎo)定語(yǔ)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(kāi)始喜歡這一新科技帶來(lái)的好處。講的是過(guò)去發(fā)生的事，與現(xiàn)在無(wú)關(guān)，排除A、C。從句中有表示過(guò)去具體時(shí)間的狀語(yǔ)（when相當(dāng)于in the early 1990s），不能用過(guò)去完成時(shí)。

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