Catherine is one of the brightest students who     from the Department of Computer Science , Brown University .
A．is graduatedB．has graduatedC．a(chǎn)re graduated D．have graduated
D
考查主謂一致及時態(tài)。句意“凱瑟琳是布朗大學計算機科學系已經(jīng)畢業(yè)的最聰明的學生之一。結(jié)合語境可知定語從句描述的是現(xiàn)在已經(jīng)完成的動作，故用現(xiàn)在完成時態(tài)。引導詞指代前面students，為復數(shù)形式，故助動詞用復數(shù)形式。選D。
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