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I have watched you two for the past ten minutes and ___ of y

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I have watched you two for the past ten minutes and ___ of you has done any work in that time.
A.neither B.either\x05C.none D.both
I have watched you two for the past ten minutes and ___ of y
此题考代词的用法
neither 两者的否定
either 两者任选其一
none 三者及其以上的否定
both 两者的肯定,两者都...
从句意可知,两者都没有做任何工作,是对两者的否定,所以答案选A
答案选 A
再问: 选neither为什么谓语动词是用单数,而不是have done?