. 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
  when引導(dǎo)的是一個(gè)非限制性定語從句，when指20世紀(jì)90年代初，當(dāng)然用一般過去時(shí)。
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