The purpose of the question is to properly identify the tense of the verb being used. For this case, we use context clues to infer that the verb is being used in the present tense and will answer accordingly.
From the sentence given, we can use the word "está" as context to determine the tense of the verb. "Está" is used in the present tense. The other ways to use this word are:
"Estuvo", signals a past tense of a verb will follow.
"Estara", signals that a future tense of a verb will follow.
The fact that the previous word is being used in the present tense allows us to infer that the verb will be used in the present tense as well. Therefore, we choose the present tense of the verb "visitar" which corresponds to "visitando" and fill in the blank with this word.
