Question

what kind of sentence is this?
what a perfect day this has turned out to be!
imperative interrogative exclamatory declarative
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Explanation:

An exclamatory sentence expresses strong emotion or excitement and ends with an exclamation mark. The sentence "What a perfect day this has turned out to be!" shows excitement about the day and ends with an exclamation mark, so it is exclamatory. Imperative sentences give commands, interrogative ask questions, and declarative make statements (usually end with a period).

Answer:

C. exclamatory