____twice,the postman refused to deliver our letters unless

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____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
用having been bitten对不对

可以.这里主要要注意的是,bite对于主语postman来说是一个被动形式,也就是说,postman应该是被咬,所以C肯定错.to be bitten,说明这个postman还没被咬,那么他就不可能不愿意来,逻辑上说不通.being bitten,是正在被咬,而后面的twice说明那个邮递员已经被咬过了,必须用完成时.而选项中又没有,故用B,bitten,这是having been bitten的省略写法.

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