Reapplying with Old Letters of Rec?

I tried applying last cycle, but due to my low OAT scores I did not receive any offers. I am currently studying to aim for a higher score so I can reapply.

Is it bad taste to ask those who gave me a letter of Rec if they can send the same letter? Should I offer to shadow/volunteer them again? Or should I try to get new Letters of Rec by new people, which would be kind of hard due to these crazy Corona times.

Any advise would be greatly appreciated.

Thank you.