The correct verb form to complete the sentence is 'visitaba.'
The correct answer is: D. visitaba
In this sentence, "visitaba" is the correct verb form in the past tense to complete the sentence. It matches with the subject pronoun 'yo' (I) and the past context of the sentence.
Using incorrect verb forms such as 'visitaban,' 'visitabas,' or 'visitar' would not align with the past tense needed in the sentence.
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