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问答题
What letter comes next in this series of letters?  B A C B D C E D F ?

参考答案

参考解析
解析:
前两个字母BA在字母表的排列顺序是2、1,CB的顺序是3、2,DC的顺序是4、3,可见一组两个字母,后一个是前一个在字母表的前一个字母,根据字母F可推断下一个是E。
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