Sales of CDs have greatly increased since the early 1990s, when people_____to enjoy the advantages of this new technology.
A．beginB．beganC．have begunD．had begun
B
本題考時態(tài)和句子結(jié)構(gòu)。句中when是關(guān)系副詞，引導(dǎo)定語從句，修飾the early 1990s。從句的意思是：當(dāng)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(dāng)于in the early 1990s），不能用過去完成時。
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