表语从句引导词的问题

Susan is ______ as an "addlehead"——she always leaves her keys on the door.

答案是：what is known

但我不理解，为什么不能选择 whom is known

这题的解析是：在表语从句中，who/whom/which不能既连接从句又充当从句中的主语或宾语，

对这个解析完全不明白是什么意思。

原本表语从句的引导词比如who/whom/which不是一般都充当成分，同时也连接从句的吗？

what在这里属于一种特殊情况吗？

这里填 what is known（不能填 whom is known)，因为 what 可以用作复合连接代词（而whom不可以），相当于 a / the person who。即：

Susan is what is known as an "addlehead"——she always leaves her keys on the door.

=Susan is a person who is known as an "addlehead"——she always leaves her keys on the door.

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