Read the sentence. During that epidemic, early warnings circulated widely. Which correctly analyzes each word’s part of speech in the sentence?

“During” is a preposition introducing the phrase “during that epidemic.” “That” is a demonstrative adjective describing the noun “epidemic,” and “early” is an adjective describing “warnings.” “Warnings” is a noun, “circulated” is the verb, and “widely” is an adverb modifying “circulated,” so choice D is correct.

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