"When was that list written?"
Translation:Danh sách kia đã được viết khi nào?
I'm wondering if it is really wrong. There is no explanation where to put khi nào or any consistency exhibited. I'm not sure your explanation holds.
The more of this course I take, the more I suspect this is arbitrary as I have seen other exercises changed to allow khi nào at the beginning OR the end. If so, mods please fix this!!