2. 专升本
  3. Sales of CDs have greatly increased since the early 1990s, when people______to enjoy the advantages of this new technology.

Sales of CDs have greatly increased since the early 1990s, when people______to enjoy the advantages of this new technology.

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问题 Sales of CDs have greatly increased since the early 1990s, when people______to enjoy the advantages of this new technology.
选项 A、begin
B、began
C、have begun
D、had begun
答案B
解析
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