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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(shí)態(tài)。句意“凱瑟琳是布朗大學(xué)計(jì)算機(jī)科學(xué)系已經(jīng)畢業(yè)的最聰明的學(xué)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(dòng)作，故用現(xiàn)在完成時(shí)態(tài)。引導(dǎo)詞指代前面students，為復(fù)數(shù)形式，故助動(dòng)詞用復(fù)數(shù)形式。選D。
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