According to the kwiz, there are 2 correct answers to the question:
haya ganado ( my answer)
ganara ( imperfect subjunctive)
The page on the subjunctive does not address using these subjunctives interchangeably. I learned that when the subjunctive trigger is in the present tense ( no está seguro) and the event being considered is in the past ( won the competition), the present perfect subjunctive is called for. Do you have a lesson the the distinction?
The lesson is about using the subjunctive after verbs that imply uncertainty. Both options are correct "haya ganado" and "ganara"; they both express an event in the past.
We do not have a lesson at the moment about the sequence of tenses in these cases. But it's been noted so, hopefully, it will be in the system soon.
Gracias y un saludo
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