The old man has a son and two daughters treating him well makes him sad.A. none of the

问题补充：

The old man has a son and two daughters, treating him well, makes him sad.

A. none of them; which

B. and none of whom; that

C. none of whom; which

D. and none of them; that

答案：

(答案→)A. none of them; which

B. and none of whom; that

C. none of whom; which

D. and none of them; that

解析：第一空为独立主格结构，them为treating的逻辑主语；第二空考查定语从句，先行词指前面提到的事情关系词which指代整件事并在从句中做主语。句意：老人有一个儿子和两个女儿，他们待他不好这使得老人悲伤。