题目内容：

He is the only one of the students who _________ a winner of scholarship for three years.
A.is B.are C.have been D.has been

优质解答

当先行词前出现the only one of 时,要把one看成是先行词,即为单数.后面从句的谓语用单数.题中有一个时间段的时间状语,选择D.(想想啊,唯一一个,能用复数吗?)
当先行词前出现one of 时,就不是这情况了.如：
He is one of the students who ___have been______ a winner of scholarship for three years（是N多当中的一个.）