He is the only one of the students who a winner of scholarship for three years. A. isB. a

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：考查定语从句。本定语从句的先行词是the only one是一个单数名词，所以后面使用单数形式，for three years通常与现在完成时连用，所以答案为D。句意：他是学生中唯一的一个三年都获得奖学金的学生。