Final answer:
The imperfect form of the verb in the sentence 'El capitán era el más feliz' is correct.
Step-by-step explanation:
The imperfect form of the verb in the sentence El capitán era el más feliz is correct. In Spanish, the imperfect tense is used to talk about ongoing or repeated actions in the past, or to describe past conditions or states of being. In this sentence, the verb 'era' (imperfect form of 'ser' meaning 'to be') is used to describe the past condition of the captain being the happiest.
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