【题目】He is the only one of the students who _____ a winner of scholarship five times up to now.
A. is B. are
C. have been D. has been
在线课程【答案】D
【解析】
考查现在完成时和主谓一致。句意：他是唯一一位三年奖学金获得者的学生。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。故D正确。