we were curious to find out what had happed.这里的what是什么用法,做宾语吗

we were curious to find out what had happed.这里的what是什么用法,做宾语吗
we were curious to find out what had happed.这里的what是什么用法,做宾语吗

we were curious to find out what had happed.这里的what是什么用法,做宾语吗
what had happened是做find out 的宾语,同时what还做happen的主语

引导宾语从句

what 在这里领导的句子整体做find out 的宾语，整体作为名词来看，在what had happened 句子内部，what做主语

what had happened 整句做find out的宾语，也就是宾语从句。其中what 做宾语从句的主语。类似的有
They did not hear what i just said.
I don't know what to do.
The president noticed what he had mistakened.