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Catherine is one of the brightest students who  &n

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Catherine is one of the brightest students who     from the Department of Computer Science , Brown University .
A.is graduated B.has graduated C.are graduated D.have graduated
D

考查主谓一致及时态。句意“凯瑟琳是布朗大学计算机科学系已经毕业的最聪明的学生之一。结合语境可知定语从句描述的是现在已经完成的动作,故用现在完成时态。引导词指代前面students,为复数形式,故助动词用复数形式。选D。