This question is different in the word order from: singular or a plural verb after "и..., и ..."? - When the verb is after the subject, plural sounds logical. However, it is common in Russian to have a verb before the subject. In this case, plural doesn't sound good, because it perceptibly contradicts the first (singular) part of the subject. For example, what is correct in the following, "встретила" or "встретили"?
Меня встретила Аня, моя старшая двоюродная сестра, и Сергей, её новый парень со старшего курса.