Answer: would visit
Explanation: If the sentence before “that” is in the Past Indefinite tense and the part after “that” includes “the previous day/week/month/year,” then the tense used will be Past Perfect or Past Perfect Continuous. However, if the part before “that” is in the Past Indefinite tense and the part after includes “the next day/week/month/year,” it indicates a Future expectation in the past, which is expressed using “would/should” + the base form of the verb.

So, the correct answer in the above sentence would be “would visit.”