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of短语作为定语从句的先行词的情况

one of the +复数名词这一结构后面的定语从句中的谓语动词，通常用复数形式，与定语从句所靠近的那个复数名词在数上保持一致。

但如果one of the+复数名词这一结构前面带有the/only/the only之类的限定语，从句的谓语动词则要用单数形式，此时从句在意义上修饰的是the one.

例如： 
Tom is one of the boys who were late that morning. 汤姆是那天早晨迟到的男生之一。 
Tom is the (only/the only )one of the boys who was late that morning.汤姆是那天早上唯一迟到的男生。