Our teacher did what she could __us with our English.A.help B.helped C.helping D.to help
选择D.这里to do 表目的,相当于 in order to.做目的状语.
意思是老师做了所有他能做的,以帮助我们学英语.断句应该是这样：
the teacher did (the thing that she chould) (in order to help with our english)