◎ 题干
—What's Mary doing?  
—She's _____ the piano. 
[     ]
A. practice playing  
B. practicing to play    
C. practicing playing
◎ 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 Mary doing? —She's _____ the piano.[ ]A. practice playing B. practicing to playC. practicing playing…”主要考查了你对  【动名词】【现在进行时】  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。