he is the only one of the student who__a winner of scholarship for three yearsa:is b:are c:have been d:has been

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he is the only one of the student who__a winner of scholarship for three years
a:is b:are c:have been d:has been

D has been.主语是单数he而且后面跟的是winner而不是winners,所以要用has been,而不是have been.

c

D

d 先行词是the only one,所以后面定语从句谓语动词用单数,后面又有for three years 所以用完成时态