◎ 题干
The lazy bone pretended ______ earnestly when his father came into his study to see what he was doing.     

A. studying  
B. to study  
C. to be studying  
D. to have studied

◎ 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“The lazy bone pretended ______ earnestly when his father came into his study to see whathe was doing. [ ] A. studying B. to study C. to be studying D. to ha…”主要考查了你对  【不定式的进行式】  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。