问题补充：
The old man has a son and two daughters, treat him well, made him very sad.
A. and none of whom; as
B. neither of them; which
C. and none of whom; what
D. none of whom; which
答案：
A. and none of whom; as
B. neither of them; which
C. and none of whom; what
(答案→)D. none of whom; which
解析：考查的定语从句，第一空是先行词是a son and two daughters由none of修饰，前面有逗号所以不用连词and，neither指两者都不。第二空的先行词是前面的整个句子故用关系词which，所以选D。
