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题型:单选题 题类:常考题 难易度:普通

黑龙江省哈尔滨市第六中学2017-2018学年高一下学期英语3月月考试卷

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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