The old lady had a son and two daughters， treated her well，which made her very sad.
A. no one of whom
B. none of whom
C. neither of them
D. none of them
网友回答
A. no one of whom
(答案→)B. none of whom
C. neither of them
D. none of them
解析：none既可指人也可指物，常暗示一定范围，因此通常与表范围的of短语连用；而no one(=nobody)只能指人，不能与of短语连用，neither表示两个都不，them不能做引导词，故选B。