Both are used.The key fit in the key hole. (pt. tense)
The key fitted in the key hole. (pt. tense)
It was the reverse with me. 'fit' is simply wrong!Wow! I had to go to the dictionary to make sure the otherwise impeccable Bhai had not lost his mind.
In the US, I have never heard "fitted" for simple past. I was about to reply that as an irregular verb, "fit" took "fit" as the simple past and "fitted" only as the participle.
Live and learn!
If you have a question about the English language and would like to ask one of our many English teachers and language experts, please click the button below to let us know: