第一、the only one of和only one of 在句中作主语,谓语都用单数形式,因为主语的数量均为1.
举例:
The only one of you is the winner.你们当中唯一的获胜者
Only one of you is the winner 你们当中仅仅一个是获胜者
第二、如果the only one of 和 only one of是定语从句的先行词且引导词,如who在从句中作主语,the only one of要求从句谓语用单数形式,only one of要用复数形式.
举例:
He is the only one of the students who is never late .
他是学生中 唯一不迟到的学生
因为从不迟到的学生(who is never late)是唯一的(the only one),is代表了唯一的学生,所以用单数
He is only one of the students who are never late .
他仅仅是从不迟到的学生中的 一个.who are never late修饰students,学生多个,所以用are