who kwew the recipe could be so confusing!
这句话什么意思，有语法错误嘛？
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没有啊。who引导的疑问句，who是主语
who knew the recipe (that) could be so confusing!
后半部分是定语从句
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who knew (that) the recipe could be so confusing!
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。。
恩 我说错了
不好意思 这个是宾语从句
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我看称 who kwew the recipe (that)could be so confusing!
所以
who knew (that) the recipe could be so confusing.
的that是不能省略的，另外最后的感叹号不对，英语的感叹号有严格的语法要求，不像汉语那样根据语意决定是否用感叹号。