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

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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　?

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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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