1)Tom is one of the students who were late this morning.
2)Tom is the only one of the students who was late this morning.
在1)句中,who的先行词可以是one of the students吗?这样的话定语从句的谓语动词为复数。
《牛津英语用法指南》第四版130.1指出:
在 one of the ... 这类表达方式后面,以 who, which 或 that开头的关系从句中既可以用单数动词,也可以用复数动词。
所以,下面的句子是正确的:
Tom is one of the students who were (或 was) late this morning.