The writer and professor whom I often refer to at the meetings famous for those works.

问题补充：

The writer and professor, whom I often refer to at the meetings, famous for those works.

A. is

B. are

C. am

D. were

答案：

(答案→)A. is

B. are

C. am

D. were

解析：whom引导的定语从句只起说明作用,句子的主语是The writer and professor,是单数概念,意义是“作家兼教授”.