Final answer:
The correct imperfect tense form of the verb for the sentence is 'O gustaban.'
Explanation:
The correct imperfect tense form of the verb for the sentence is: O gustaban.
In the sentence given, the correct form of the irregular verb 'gustar' in the imperfect tense to match the subject 'a Joan y a mí' is 'gustaban,' which means 'liked' in English.
Therefore, the full correct sentence should be: En el otoño de 2006, a Joan y a mí no nos gustaban las canciones ni los instrumentos de la banda.
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