Final answer:
The verb in the correct tense is "iban".
Step-by-step explanation:
The correct verb in the sentence is iban.
When asking about Francisco's past actions of attending multiple weddings in the summer of 2003, the verb needs to be in the past tense. The infinitive verb form "ir" (to go) irregularly transforms into "iban" for the subject "tú" in the imperfect tense.
Example: Francisco, en el verano de 2003, ¿tú iban a muchas bodas de tus amigos y familiares?
Learn more about verb conjugation in Spanish