What is the noun clause of The Judge was stunned at what happend next?

The noun clause in the sentence "The Judge was stunned at what happened next" is "what happened next".

Here's why:

* Noun clauses act as nouns in a sentence. They can be the subject, object, or complement of a verb.

* In this sentence, the noun clause functions as the object of the preposition "at". The judge was stunned *at what?* The answer is "what happened next".

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