问题补充：
Mr. Green has two sons, one of working as a bus driver now.
A. who
B. whom
C. them
D. whose
答案：
A. who
B. whom
(答案→)C. them
D. whose
解析：考查独立主格结构。根据one of working as a bus driver now中没有谓语动词可知不是从句，them指代前文提到的两个儿子，选项ABD一般用于引导定语从句，故选C。格林先生有两个儿子，他们其中一个现在做公交司机。
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