i have no idea which was better so I took ___ of them 代词

i have no idea which was better so I took ___ of them 代词
i have no idea which was better so I took ___ of them   为什么答案是 both   为什么 all和 none  不行
英语人气:281 ℃时间:2019-10-20 20:01:56
优质解答
both ---------二者肯定
all---------------三者以上肯定
none---------------三者以上否定
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