◎ 题干
-What's Tom doing?  
-He is busy       his homework.  
[     ]
A. doing    
B. to do    
C. do        
D. did
◎ 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“-What's Tom doing? -He is busy his homework. [ ]A. doingB. to do C. doD. did…”主要考查了你对  【动名词】  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。