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Choose the correct form of the verb "to visit" in the present perfect tense for the following sentence.
They _________________________ the museum this week.
The present perfect tense is formed using the auxiliary verb "have" or "has" followed by the past participle of the main verb. In this case, the subject is "they," which requires "have" as the auxiliary verb, and the past participle of "to visit" is "visited." So, the correct answer is "have visited."