There are three young people in our group.______of them are girls.

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问题 There are three young people in our group.______of them are girls.

选项 A、No one
B、All
C、Either
D、Both

答案B

解析 all修饰三者或三者以上,作主语时谓语动词用复数;both修饰两者,作主语时谓语动词用复数;either表示其中之一,作主语时谓语动词用单数;on one不能与of连用,作主语时谓语动词也用单数。故选B。
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