I am a member of the AS support group. Yes, you can get it after one d&c.... the most common is from a postpartum d&c for retained tissue, or following a late loss or termination. However, you can also get them from an early d&c, or any kind of uterine surgery. You can also have adhesions from infection, although surgery/instrumentation of some kind is almost always the cause.
It's a bit too complex to go into here, but I want to say that although it can definitely happen if the doctor is too aggressive, some women simply scar very easily and we don't know why.
We have one of the world's top experts here in Sydney. I encourage anyone who has been diagnosed, or even suspects it, to look at the site under Yahoo health groups. The group is fantastic & there is a wealth of information available on the site, or by posting to members.