I have two elder brothers, in the army for ten years.
A. the elder of whom served
B. the older having served
C. the older of which served
D. the elder one has served
网友回答
A. the elder of whom served
(答案→)B. the older having served
C. the older of which served
D. the elder one has served
解析：考查独立主格结构：句意：我有两个哥哥大哥哥在军队服役10年了。Elder一般用在sister和brother前面，表示哥哥，姐姐，用older是表示比较，指年龄大的那个哥哥，排除AD，C项因which 不能修饰人，不可。这里用having served是现在分词的完成式，与the older(年龄大的那位)形成逻辑上的主谓关系。这里必须是非谓语动词，构成独立主格结构。选B。