选A是正确的
preoccupied是说：thinking about something so much or spending so much time doing something that you do not notice other things or cannot think about other things 就是说你过于关注其它事以至于你不能考虑其它事情
而absent-minded是指：likely to forget things or to think about something different from what you should be thinking about
体会一下哦
用A 更好