nearly half of those diagnosed with the virus are black. 是nearly half of those which are diagnosed with the virus are black的省略；. are diagnosed with 是一个固定搭配，“被诊断患有.....携带......之意 ”with在句子中是介词短语，作状语；全句一是: 几乎一半的被诊断携带病毒的人是黑人。
答：不是的，是一般现在时态，前面的nearly half of those diagnosed with the virus 是主语部分，are 是谓语动词，bla...详情>>
答：详情>>
