He was depressed by what he had gone through.
He was depressed by what he had known.
1. 我看到曹老师解答的时候提到what在这种结构中引导的是名词性从句,但没有说是什么类型的名词性从句,请问老师是什么类型的名词性从句呢?之前有老师把第一句分析为“宾语从句”,这种说法对吗?
2. by的词性是介词吗?by what he had known作什么成分呢?
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