___of the twins has been there before A all B Neither C Both D None

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___of the twins has been there before A all B Neither C Both D None
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___of the twins has been there before A all B Neither C Both D None
___of the twins has been there before A all B Neither C Both D None

___of the twins has been there before A all B Neither C Both D None
B
这里的是twins,双胞胎,说明是两个人,可以排除A和D,这两个用于三者或三者以上
后面的谓语动词是has,单数,C的both表示两者都,两个人,谓语动词应该用复数have,排除C.
剩B,两者都不,谓语动词用单数

D

B.因为twins是两者,所以排除AD,又因为用has ,说明不是肯定,所以B