1 one of+复数名词+关系代词+复数形动词 

the(only)one of+复数名词+关系代词+单数形动词 
The Great Wall is one of the world-famous buildings that draw lots of visitors 
长城是吸引大批游客的世界伟大建筑之一。
Titanic is one of the most wonderful movies that have been produced in Hollywood. 
《泰坦尼克号》是好莱坞生产的最精彩的电影之一。 
但如果前面加上the 或the only 之类的限定词，则定语从句中的谓语动词就要用单数。 
Titanic is the (only)one of the most wonderful movies that has been produced in Hollywood. 
《泰坦尼克号》是好莱坞所生产的唯一一部精彩的电影。 
He is the (only)one of the students who knows Russian in our 
school. 
他是我校唯一懂俄语的学生。 

2 what 不能用于定语从句中 

(×)Tell me anything what you know. 
(Ο)Tell me anything that/省略you know. 
(Ο)Tell me what you know. 
（what 引导宾语从句=anything that） 
告诉我你所知道的一切。 
(Ο)I want to give you all (that)I have. 
(×)I want to give you all what I have. （what 不能引导定语从句） 
(Ο)I want to give you what I have. 
（what 引导宾语从句=all that/anything that） 
我想把我所有的一切都给你。