@ goc...
Whenever I fly in Quebec (or France) I use French as the primary language (my choice).
However when I fly into and uncontrolled airport in Quebec and I hear both languages being used on the frequency then I do all my coms in both languages so that all parties understand the message clearly.
I'll add the following... I believe most commercial pilots that fly mainly in Quebec also understand English and probably knew and understood everything you said on the radio.