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 |
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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 |