◎ 题干
      certain that his invention will lead to the development of production.
A.That's    B.This is    C.It's    D.What's
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◎ 解析
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◎ 知识点
    根据魔方格专家分析,试题“certain that his invention will lead to the development of production.A.That'sB.This isC.It'sD.What's…”主要考查了你对  【人称代词】【相互代词】【疑问代词】【关系代词】  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。