__________twice, the postman refused to deliver our letters unless we chained...

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问题 __________twice, the postman refused to deliver our letters unless we chained our dog.

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

答案B

解析The postman与bite之间存在逻辑上的动宾关系,且被咬已是事实,故排除C、D两项;被咬的动作已经完成,故排除A项。
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