◎ 题干
  Tom ______ the book before he took it. 
A. looked up           B. looked for           C. looked through 
◎ 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“ Tom ______ the book before he took it.A. looked up B. looked for C. looked through…”主要考查了你对  【实义动词的单数第三人称形式】【实义动词】【动词短语】  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。