In Spanish sentences, direct object pronouns must be in the objective case. In this case, 'lo' would best replace the direct object in the sentence given.
When the direct object is a pronoun, it must be in the objective case. In the sentence 'Nosotros compramos un reloj de oro.' the direct object 'un reloj de oro' can be replaced by the pronoun 'lo'. Therefore, 'Nosotros compramos un reloj de oro.' would become 'Nosotros compramos lo.'
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