Continue where left off for multiple learners on the same computer

We have a somewhat persistent issue that comes up from time to time, whereby a client will have several learners go through a training course on the same computer. Obviously, when learner #2 logs into their individual account on our site, and launches their training course, it will ask them if they like to continue from where they left off based on the session from learner #1. Even if they are logged into a different account.  If they click yes, they are brought to the end with exam questions pre-selected from the last session. Obviously not ideal.

Is there a way to prevent this for situations like this, where multiple folks are taking the same course, via a different login on our site, but on the same computer?