To complete the sentence, substitute the noun 'Los turistas' with the pronoun 'they'. The object pronoun 'visiting' combines with 'them' to form 'visitingthem'.
Los turistas están visitando el museo.
Están substituting the noun with the pronoun 'they' and the object pronoun 'visiting' as 'visitingthem'.
Object pronouns are used to replace nouns in sentences, improving clarity and avoiding repetition.
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