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In the sentence taken from the text “Over the past few centuries,
it has served as an adjective, an adverb, a noun, and a pronoun”,
the pronoun in bold letters refers to the word “other”.
Sometimes, though, “it” does not have a referent and serves a
grammatical function only, thus being named, for example,
“dummy it”. Mark the alternative in which “it” has a referent.
