35. 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

34.　 ________ is often the case, we have worked out the production plan.

　 　 A. Which　　　　 　　B. When　　　　 　C. What　　　　　 D. As

33. A man is being questioned in relation to the ________ murder last night.

　　 A. advised　　 　　　 B. attended　　　 　C. attempted　　　 D. admitted