◎ 题干
Beijing ______a lot in the past ten years. Now it has become one of the biggest modern______ in the world.
A.changes, citiesB.changed, city C.changed, cities D.has changed, cities
◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“Beijing ______a lot in the past ten years. Now it has become one of the biggest modern______ in the world. A.changes, citiesB.changed, city C.changed, cities D…”主要考查了你对  【一般现在时】【过去进行时】【过去完成进行时】  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。