---Mary is a careful girl．
---Yes. She always goes over her exercises to there are no mistakes．
A. look for
B. make sure
C. find out
D. think about
网友回答
A. look for
(答案→)B. make sure
C. find out
D. think about
解析：look for寻找；make sure确信，证实；find out找出，查明；think about考虑。句意：玛丽是个细心地女孩。——是的，她总是检查她的练习题来确定没有错误。结合语境可知选B。