His father a famous university professor who is said to have started his teaching career

问题补充：

His father, a famous university professor, who is said to have started his teaching career in Australia, in Nanjing University for more than twenty years.

A. has worked

B. worked

C. is working

D. will work

答案：

A. has worked

(答案→)B. worked

C. is working

D. will work

解析：原句意思是，他的父亲在南京大学工作了二十多年。他是一位著名的大学教授，据说在澳大利亚开始他的教育生涯。表示过去发生的事情用一般过去时，所以选B。