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She is one of the few persons ____ Spanish in our school.B w

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She is one of the few persons ____ Spanish in our school.B who know Dthat speak 为什么不用speak
who knows 和that speaks,that 和who不都能指人么。
首先这是定语从句,先行词,即被修饰名词是人的时候关系词用who.
其次,这道题考查的是先行词中出现one of 的情况.这种情况下,当one of 前没有修饰词时,先行词为one of 后面的名词,如本句的先行词就是persons,因此从句中的动词know不用第三人称单数.而当one of 前有修饰词时,先行词看做单数,即”one“为先行词,如“She is the only one of the few persons"时,从句应该是"who knows Spanish ".