Using a relative clause: When I was in Shanghai, I visited the house. Sun Yat-sen is said to have lived there for several years.
【正确答案】：When I was in Shanghai, I visited the house where Sun Yat-sen is said to have lived for several years.
【题目解析】：这里我们把house作为先行词，把后面的句子变成where引导的定语从句，即“据说是孙中山居住数年的”。