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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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