Final answer:
The correct imperfect tense form of the verb to complete the sentence is 'encantaba'.
Step-by-step explanation:
The correct imperfect tense form of the verb to complete the sentence is encantaba. In this sentence, the subject is 'me' which is the first person singular pronoun, and the verb 'encantaba' agrees with this subject. The imperfect tense is used to describe ongoing, habitual actions or states in the past. Therefore, 'encantaba' is the correct form to express the past habit of enjoying playing the clarinet and the flute in his childhood.
Learn more about imperfect tense in Spanish