摘要： Sales of CDs have greatly increased since the early 1990s, when people to enjoy the advantages of this new technology.
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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
查看习题详情和答案>>. 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
查看习题详情和答案>>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
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