Xi'an is one of the best cities which are famous for its history.此从句谓语为什么用are,但后面用its

Xi'an is one of the best cities which are famous for its history.此从句谓语为什么用are,但后面用its

【one of + 复数名词】后面的关系代词一般代的是复数名词
如果前面有the only ,代的就是one 了,此时, 谓语用单数,试比较：
Xi'an is 【the only】 one of the best cities which【 is 】famous for its history
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