【题目】He has two children, both of ______ being abroad.
A. them B. that
C. which D. whom
在线课程【答案】A
【解析】考查独立主格结构。句意：他有两个孩子，都出国了。首先根据后面的being abroad可判断，后一句不是句子，排除D项，因D项whom作关系代词，连接两句话，但此处不是一句话；指人不能用that和which，排除B、C项；both of them being abroad不是句子，为独立主格结构，both of them为逻辑主语。故选A项。