◎ 题干
—Mary can't help ______ the house. Why?
—Because she is busy______ a hotel reservation.
A. cleaning; making         B. to clean; making          C. cleaning; to make    
◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“—Mary can't help ______ the house. Why?—Because she is busy______ a hotel reservation.A. cleaning; makingB.to clean; makingC. cleaning; to make…”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。