答案应为it,这是一个动词短语引导的宾语从句,FOUND OUT 后面省略了that,宾语应该是一个完整的句子因此不能用who,又根据语义‘不知道’,因此选it,最为合适,这也应该是固定用法.
She never found out____(who ,this,it,he)was him
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