Tom is not what he used to be中从句引导词为何要用what,用who或whom可以吗

问题描述:

Tom is not what he used to be中从句引导词为何要用what,用who或whom可以吗

在表语从句中,关系代词是有实际含义的~
这个句子是:Tom 已经不是原来的他了
从句是 What did Tom use to be Tom 过去是什么样的?的肯定句语序
如果是Who/Whom did he use to be?意思完全走样了~成了Tom过去是谁了