题目
The old man has two daughters, ______ are doctors.A. both of themB. both of whomC. both whoD. they both
The old man has two daughters, ______ are doctors.
A. both of them
B. both of whom
C. both who
D. they both
题目解答
答案
B. both of whom
解析
此题考查定语从句的用法。句子主干为"The old man has two daughters"，逗号后为定语从句，修饰先行词"two daughters"。先行词在从句中作主语，指人，因此关系代词应为"who"或"whom"。"both of whom"是"both of them"的定语从句形式，符合语法要求。