catherine is one of the brightest students who have graduated from the depatment of computer

catherine is one of the brightest students who have graduated from the depatment of computer

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