A-13. 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

A-13. 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

出自：江苏开放大学大学英语（B）作业1

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