but what is it about these stories that has made them such a phenomenon，求句子成分，谢谢
整个句子里是一个It is … that …类型的强调句的问句形式，其中
but是转折词；
what is it about these stories是主句，这是个主系表结构的句子：主语是it，is是系动词，what是表语，而about these stories作what的后置定语；
that has made them such a phenomenon是整个句子的主语从句（整个句子的真实主语！），这其中that作引导词同时是从句主语，had made作谓语，them作间接宾语，such a phenomenon作直接宾语。
注：
① 对这类结构复杂的句子，可以用字母A代替what，先把它转化为陈述语气的句子：
It is A about these stories that has made them such a phenomenon.
然后把It is和that去掉，发现剩余部分仍是完整的句子，则原句必是强调句无疑。
② 在上述陈述式强调句里，
it是形式主语；
is是系动词；
A about these stories作表语，其中about these stories作A的后置定语；
that…phenomenon是主语从句…
这些就很明显了。
③ 上述陈述式强调句对应的非强调句是
What has made these stories such a phenomenon is A about them.
想通了，谢谢！
追答哈哈，想通了就好。
谢谢采纳！祝学习顺利！🌹🙏