◎ 题干
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The house caught ______ fire while they were away. It must have been set ______ on fire by someone.
A.a; aB.a; /C./; aD./;/
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“.The house caught ______ fire while they were away. It must have been set ______ on fire by someone.A.a; aB.a; /C./; aD./;/…”主要考查了你对  【不定冠词】【定冠词】【零冠词】  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。