The correct verb to fill in the blank is 'estuviste,' which is the second-person singular past tense of 'estar.' This verb accurately completes the question by asking about someone's location last night. The other options do not fit the context of the sentence. ;
The correct verb to fill in the blank is 'estuviste,' which makes the complete question: '¿Dónde estuviste tú anoche?' This translates to 'Where were you last night?' and is the appropriate past tense form of 'estar' for the second-person singular form.
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