Mr.Smithhastwosons,oneof()workingasabusdrivernow.为什么填them而不能用whomIt'sbelievedthattheelectionofObama,()motherwasawhiteAmericanandfatherablackAfrican,canprovidemuch-neededinspirationtoblackyouth.为什么

Question

Mr.Smith has two sons,one of( )working as a bus driver now.为什么填them而不能用whom
It's believed that the election of Obama,( )mother was a white American and father a black African,can provide much-needed inspiration to black youth.为什么用whose而不能用of which

Answer 1

第一题是根据working这个分词填的,one of them 是working的逻辑主语； 如果work当作从句的谓语动词用,那么后半句是这样的,one of whom works sa a bus diver now.
第二题只能用whose,因为mother的修饰语是Obama's,指的是奥巴马的妈妈,那么既然先行词是Obama,关系代词在从句中作定语,就用whose.of which 不能用,因为先行词是人不是物.