◎ 题干
—Look, what's _____ the tree?      
—A bird. It is _____ there.       
A. on; singing                  
B. in; singing  
C. from; singing                
D. to; singing
◎ 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“—Look, what's _____ the tree?—A bird. It is _____there.A. on; singingB. in; singing C. from; singingD. to; singing…”主要考查了你对  【介词】  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。