catherine is one of the brightest students who have graduated from the depatment of computera :has graduated b:have graduated;

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catherine is one of the brightest students who have graduated from the depatment of computera :has graduated b:have graduated;
catherine is one of the brightest students who have graduated from the depatment of computer
a :has graduated b:have graduated;

catherine is one of the brightest students who have graduated from the depatment of computera :has graduated b:have graduated;
你的意思是想问为什么选B吧?
have 这个助动词的形式要看前面的主语who ,关系代词who 所指代的先行词是 students,是复数形式,所以用have,前面是单数的话才是has.

B