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
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(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。