高考英语单选题:请您帮我解答下面的题,并说明原因,___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 P.S.请解释选项A为什么不能.

问题描述:

高考英语单选题:请您帮我解答下面的题,并说明原因,
___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
P.S.请解释选项A为什么不能.