8、The old woman has two sons,one is a teacher.A．of who B．of whom C．of which D．of them

题目

8、The old woman has two sons,one is a teacher.A．of who B．of whom C．of which D．of them
选B 但我想知道为什么

答案

空格是在one后面?
whom用来作为定语从句的引导词,代替one of them,them是宾格,所以用whom代替