27．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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27．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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