twice, the postman refused to deliver our letters unless we chained our dog. A．B

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

试题答案

B

考查过去分词的用法。此处because the postman was bitten twice，he。。。=Bitten twice。