. I have taught hundreds of students, having been working in their fields for years.
A. some of whom
B. some of them
C. most of whom
D. who
网友回答
(答案→)A. some of whom
B. some of them
C. most of whom
D. who
解析：考查定语从句。句中先行词为students，在从句中作some of的宾语，故用关系词whom。句意：我已经教过几百位学生，其中一些已经在他们领域工作多年了。