Question

Fill in the blank with the letter or the combination of letters that would make the following sound "ain" and complete the sentence.

J'ai trois chiens et ____ chat.

Answer 1

I disagree with the sound being similar to "ain" but think about what the sentence means:

I have three dogs and __ cat.
Logically, there is only one word (a number) that could fill in the blank. The fact that cat is singular helps narrow it down immediately.