He is the only one of the students who has been aHe is the only one of the students who has been a winner of scholarship for three years. 他是惟一一个连续三年获得奖学金的学生. 请问这里的定句从句中 has been是什么意思?

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He is the only one of the students who has been a
He is the only one of the students who has been a winner of scholarship for three years.
 
他是惟一一个连续三年获得奖学金的学生.
 
请问这里的定句从句中  has been是什么意思?是什么语法?

已经是