◎ 题干
---Nanjing develops so fast. A fourth underground line is being built.
---That’s true. It __________ a lot already.
A. changes    B. changed    C. has changed    B. will change
◎ 答案
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◎ 解析
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◎ 知识点
    根据魔方格专家分析,试题“---Nanjing develops so fast. A fourth underground line is being built. ---That’s true. It __________ a lot already. A. changes B. changed C. has changed …”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。