twice, the postman refused to deliver our letters unless we chained our dog. A. Being bitt——青夏教育精英家教网—

摘要： 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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________ twice, the postman refused to deliver our letters unless we chained our dog. (2009北京卷)

A. Being bitten B. Bitten C. Having bitten D. To be bitten

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