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

____ twice, the postman refused to deliver our letters unless we changed our dog.  

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

试题答案

B。 

解析:

考查分词的用法。The postman与bite之间是被动和完成的关系，所以答案为:B。