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

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问题 He is the only one of the students who ______ a winner of scholarship for three years.

选项 A、is
B、are
C、have been
D、has been

答案D

解析 该定语从句修饰的先行词是the only one,所以从句中的谓语动词应该用单数形式,而且从句中的时间状语for three years提示该空应用完成时态,所以应选[D]。
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