___twice ,the postman refuse to deliver our letters unless we chained our dog up.A Having bitten B Being bittenC Bitten D To be bitten

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___twice,thepostmanrefusetodeliverourlettersunlesswechainedourdogup.AHavingbittenBBeingbittenCBitten

___twice ,the postman refuse to deliver our letters unless we chained our dog up.A Having bitten B Being bittenC Bitten D To be bitten
___twice ,the postman refuse to deliver our letters unless we chained our dog up.
A Having bitten B Being bitten
C Bitten D To be bitten

___twice ,the postman refuse to deliver our letters unless we chained our dog up.A Having bitten B Being bittenC Bitten D To be bitten
本题应选C ,过去分词做状语,与句子的逻辑主语the postman 之间构成被动关系,表示已经发生的动作,句子语义为：这个邮递员被狗咬过两次后,我我们不把狗用铁链拴起来,他就不给我们送信

因为有twice，最好的答案是having been bitten，现在没这选项，只能选C。B的话不能选，因为being done表示进行时态，这里就是状态，没有进行时态。

最恰当的应该是having been bitten吧~
这里，选b吧~

答案肯定C了。是(because the postman was )bitten 的省略形式。即主从复合句，如从句的的主语和主干句主语一致，其后又含有be动词，往往可以省略。而B意思:正在被咬，与题干意思不符。句子意思为：这个邮递员因为被狗咬过两次后，所以如果我们不把狗用铁链拴起来，他就不给我们送信。当然把A改成having been bitten表完成动作，也行...

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