单选题The writer and professor

问题补充：

单选题Thewriterandprofessor,whomIoftenrefertoatthemeetings,____famousforthoseworks.A.isB.areC.amD.were

答案：

A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”.