Final answer:
The correct phrase that completes the sentence is 'il y a du'
Step-by-step explanation:
The correct phrase that completes the sentence 'En automne ______ vent.' is il y a du vent.
This phrase means 'There is wind' in English. It describes the weather condition of having wind during the autumn season.
For example, you could say 'En automne, il y a du vent qui souffle les feuilles des arbres' (In autumn, there is wind that blows the leaves from the trees).
Learn more about Completing sentences in French