He is looking up adverb or preposition
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Answer:
Adverb
Explanation:
up is an adverb according to the sentence.
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The word up can be used as a preposition or as an adverb particle. For example, it is an adverb particle in the expressions stand up and blow up. Note that an adverb particle doesn't have an object. A preposition is always followed by a noun or a noun equivalent which serves as its object۔
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