She came back with her two friends, .A.neither of them are doctorsB.neither of them is a doctorC.neither of whom are doctorsD.neither of whom is a doctor
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D解析本题考查非限制性定语从句中引导词和主谓一致的用法。非限制性定语从句的引导词不能用人称代词them，排除A、B两项；而且在非限制性定语从句当介词of的宾格只能用whom，neither of+复数名词，谓语动词用单数，再排除C，故选择D。