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The sentence that correctly uses the superlative form of an adverb is he was able to score a touchdown because he moved the most swiftly. The correct option is D.
What is an adverb?
Adverbs are a word that modifies the meaning of verbs or adds more details to the verbs. For example, he is running slowly, so the word slowly is an adverb.
Here, the word swiftly is a superlative word, and it is an adverb because it is describing the verb, moved.
Thus, the correct option is D. He was able to score a touchdown because he moved the most swiftly.
Learn more about adverbs, here:
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