◎ 题干
_________ twice , the postman refused to deliver our letters unless we chained our dog.
[     ]
A. Being bitten                  
B. Bitten
C. Having bitten                
D. To be bitten
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“_________ twice , the postman refused to deliver our letters unless we chained our dog.[ ]A. Being bittenB. BittenC. Having bitten D. To be bitten…”主要考查了你对  【过去分词】  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。