◎ 题干
He did not know it but his little puzzle had started a whole new branch of mathematics _____ “topology”.
In his honor this puzzle ______ “finding the Euler path.”.

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A. calling; called
B. called; is called
C. is called; called
D. calls; calling
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“He did not know it but his little puzzle had started a whole new branch of mathematics _____ “topology”. In his honor this puzzle ______ “finding the Euler path…”主要考查了你对  【过去分词】【一般现在时的被动语态】  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。