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Mary is the only one of the teachers who ________ a little C

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Mary is the only one of the teachers who ________ a little Chinese because she is one of my friends who ________ been to China.
A.know;have B.knows;has
C.knows;have D.know;has
Mary is the only one of the teachers who ________ a little C
C

C
解析 此句包含了两个定语从句,关系代词都在从句中作主语。关系代词的单复数应与定语从句的先行词的单复数保持一致。第一个从句的先行词是the only one of the teachers,指唯一的老师,从句谓
语动词应用单数形式。第二个定语从句先行词是my friends,表示的是复数概念,所以从句谓语用复数,因此答案为C项。