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You say it that way because in Spanish the adjectives and articles have to agree in gender and number with the noun(s) or pronoun(s). "Es la una" is a reference to a femininenoun or pronoun. That being the case, uno, being a masculine singular adjective, is incorrect, because it fails to agree in gender, even though it agrees in number (singular). Another reason is that, when telling time, they are las horas, the hours, and they are all feminine: la una, las dos , las tres, las cuatro, etc.

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14y ago

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