题目内容

Mr Black has two sons, one of ________working as a doctor.
A．themB．whoC．whomD．whose
A

试题分析：句意为：布莱克先生有两个儿子，其中的一个是一名医生。逗号之后没有谓动词，此处不是一个句子，因此也就排除了非限制性定语从句的可能，这里应是一个独立主格结构，其构成方式为：n/pron+doing/done/to do. one of them与working 之间的关系为主动，前面缺少主语的格式，故为one of them,
而one of +whose/who/whom为非限制性定语从句关系词。所以答案应为A
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