I started asking "What did you work on today?" instead of asking about learning. I've realized that his IS often learning something, but the way he learns is basically via osmosis, so he has no recollection of when it happened, he just knows that he knows it now. This also helps me keep track of what they are working on in class, and sometimes helps trigger his memory on what homework/projects he's meant to be doing.
BTW, I am SO FRIGGING EXCITED to start the new school year with him going to the spec ed teacher at the end of each day. We might actually have a school year without dozens and dozens of zero's for missing work on his report card!