“one of the+复数名词+定语从句”结构的主谓一致
       
 The Cutty Sark was one of the fastest sailing ships that has ever been  built.（摘自新概念）

如果“one of the+复数名词+定语从句”这类结构的one之前有the only, the very 等修饰，则其中的定语从句通常被认为是修饰one的，所以，若引导定语从句的关系代词在定语从句中作主语，则定语从句的谓语动词通常用单数。      

 关于这个问题，《英语用法指南》（M. Swan 著）是这样说的：
      在这个句子里：She’s one of the few women who have climbed Everest 
      (她是几位登上埃佛勒斯峰的妇女之一)，动词have为复数，因为主语(who)指的是复数(the few women)。但是，这个句子也包含着She 

“one of ＋复数名词＋定语从句” 结构中的主谓一致

1.在 “one of ＋复数名词＋定语从句” 结构中，定语从句中谓语动词的单复数应由它修饰的先行词的数来决定。如：

This is one of the rooms that were damaged in the fire.这就是那次大火烧毁的房间之一。

This is one of those novels which begins with an idea.

This is one of the rooms that are free now．这是目前空着的房间之一。

 2.在“the only one of ＋复数名词＋定语从句” 结构中，定语从句的谓语动词应用单数形式。如：

Mary is the only one of the youngest girls who plays in the band.玛丽是参加乐队伴奏的最年轻的姑娘。

He is the only one of the teachers who knows French in our school.

He is the only one of those workers who is able to do this job．他是那些工人中唯一能做此工作的人。