定语从句先行词是人被最高级修饰时关系代词应使用什么

定语从句中先行词为形容词最高级时,只用关系代词that。
1 。当先行词既有人又有物时,关系代词用that,不用which。
He asked about the factories and workers that he had visited。
2。当先行词有形容词最高级修饰时,关系代词用that,而不用which。
Guilin is one of the most beautiful cities that I have ever visited