In another audio that ended with a 't', souded like 'd' as well. Don't remember which one.
i think it was in the picture word section at the beginning of the lesson. i agree that it sounded like a "d".
This woman's pronunciation sounds like a "D," but don't get caught up in that. You shouldn't pronounce it as a "D".
The sounds are close. I definitely hear D, but from your comments I guess we should aim for T.