Final answer:
The correct verb to fill in the blank in the sentence is 'estuviste' and it is used to indicate where someone or something was located in the past.
Step-by-step explanation:
The correct verb to fill in the blank in the sentence '¿Dónde tú anoche?' is 'estuviste'.
'Estuviste' is the past tense of the verb 'estar' which means 'to be' in Spanish. It is used to indicate where someone or something was located in the past. For example, Estuve en casa anoche (I was at home last night).
So, the correct sentence would be '¿Dónde estuviste tú anoche?'
Learn more about Spanish Verbs