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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◎ 解析
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◎ 知识点
根据n多题专家分析，试题“Sales of CDs have greatly increased since the early 1990s, when people_____to enjoy the advantages of this new technology.A．beginB．beganC．have begunD．had begun…”主要考查了你对 【一般现在时】，【将来进行时】，【过去完成进行时】，【过去将来时的被动语态】 等知识点的理解和应用能力。关于这些知识点的“档案”，你可以点击相应的链接进行查看和学习。
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