Final answer:
The correct choice to complete the sentence is 'O fuiste.....tuve'.
Step-by-step explanation:
The correct answer to complete the sentence is O fuiste.....tuve. The sentence is asking about a past action or experience that happened to the subject 'tú'. In this case, the verb 'fuiste' (you went/were) should be followed by the verb 'tuve' (you had). For example, 'O fuiste a España una vez cuando tuviste la oportunidad de visitar a tu familia.' (Or you went to Spain once when you had the chance to visit your family.)
Learn more about Completing a sentence in Spanish