问题补充:
The man was an old classmate of mine.
A. you just talked to him
B. who just talked to
C. you just talked to
D. whom you just talked
答案:
A. you just talked to him
B. who just talked to
(答案→)C. you just talked to
D. whom you just talked
解析:这要求一个定语从句(whom) you just talked to,其中关系代词whom用从句的to宾语,可以省略去。