“one of+名词复数”后面的定语从句,谓语动词应该用复数；而“the (only) one of +名词复数”后面的定语从句的谓语应该用单数形式
He is one of
the students that have passed the exam他是通过了考试的学生之一.
He is the (only) one of the
students that has passed the exam.他就是通过考试的那个学生.