问题补充:
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
答案:
A. is
B. are
C. have been
(答案→)D. has been
解析:根据for three years,故用现在完成时,且这个定语从句的先行词是the only one of the students,故谓语动词用单数,所以选D。