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
网友回答
A. is
B. are
C. have been
(答案→)D. has been
解析：考查主谓一致。句中的先行词为the only one，在定语从句中作主语，故谓语动词用单数。根据句中的时间状语for three years，故时态用现在完成时。句意：他是唯一一位三年奖学金获得者的学生。故D正确。