______ of them has been to Beijing before.A、EachB、BothC、AnA本题考查主谓一致。B、C谓语都应该使

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问题 ______ of them has been to Beijing before.

选项 A、Each
B、Both
C、An

答案 A

解析本题考查主谓一致。B、C谓语都应该使用复数形式，因此排除。

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