I have no idea where the journalist could have got his information from.这是什么从句?

问题描述:

I have no idea where the journalist could have got his information from.这是什么从句?

同位语从句.
在have no idea后接的是同位语从句,相当于:don't know,如果改成don't know就是宾语从句了.
I have no idea what he is doing=I don't know what he is doing.