Question

He has two sons, __________ work as chemists.为什么选C

He has two sons, __________ work as chemists.为什么选C
A. two of whom B. both of who C. both of whom D. two whom

A，D显然错，所以不用回答A，D的问题。我疑惑的是B 和C，为什么B不能选。因为从句中显然缺主语，那么按理说应该是who进来，为什么答案选C

Answer 1

of介词后面用宾格形式

Answer 2

sons是前面句子的宾语，所以应该是whom

追问

好像，选引导词应该看从句，不过还是谢谢啦~

Answer 3

of 是介词，介词后面要用宾格
who 的宾格是 whom