单选题 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

【正确答案】 A
【答案解析】[解析] 主谓一致。当one之前有the only修饰时，关系代词的先行词是one而不是靠近它的复数名词，因此从句的动词应是单数形式。