Put the verbs in the correct form in the affirmative sentences. You (to go) on an excursion to the CNN Tower in Toronto, Canada.

The sentence uses the present perfect tense because it refers to a past action with relevance to the present (an excursion that has been taken). The subject "You" is plural, so the auxiliary verb should be "have". The past participle of "go" is "gone". Therefore, the correct form is "have gone".