摘要： 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 20 Turn on the television or open a magazine and you advertisements showing happy families A. will often see B. often see C. are often seeing D. have often seen 21 ---- I hear Jane has gone to the Holy Island for her holiday. ---- Ob, how nice! Do you know when she ? A. was leaving B. had left C. has left D. left

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