选A 首先I thought 是插入语，可以直接划掉，不影响句子 who引导的是定语从句，修饰安德森先生，因为先行词是人Mr anderson，所以只能是who 或whom，又因为在从句中是主语，所以用who
第2个回答 2012-10-12
A 但是题应该是 Mr anderson , -----I thought died 3 years ago ,is still living -----I thought died 3 years ago 是定语从句，修饰Mr anderson 。I thought是插入语，定语从句缺died的主语本回答被网友采纳
第3个回答 2012-10-12
答案选 A ； Mr. Anderson, I thought, who died 3 years ago, is still living (= 我原来认为三年前就逝世的安得森先生还健在) 中的 who died 3 years ago 是非限定性定语从句，修饰“人”，且关系代词又充当主语，只能选 who.