Final answer:
The appropriate imperfect verb to fill in the blank is 'era'. The imperfect tense is used to describe ongoing or habitual past actions.
Step-by-step explanation:
The appropriate imperfect verb to fill in the blank in the sentence is A. era. The sentence would then read: 'Cuando yo era ocho años, fui a la playa con mi familia.' The imperfect tense is used to describe ongoing or habitual past actions, which is fitting in this context.
Unlike the preterite tense, which is used for completed actions in the past, the imperfect tense indicates actions that were ongoing or repeated in the past. In this sentence, the speaker is describing a past event when they were eight years old and went to the beach with their family. We use the imperfect verb 'era' to indicate their age at that time.
Some examples of when to use the imperfect tense include describing past habits, recurring actions, physical or emotional states, and time or age in the past. It is important to understand the difference between the imperfect and preterite tenses to accurately communicate past events in Spanish.
Learn more about Imperfect tense in Spanish