You have to--your homework--before handing it in.如何选择

You have to__your homework__before handing it in.如何选择
A:look,through B:look,for C:look,at D:look,up
如何解释这个句子呢,翻译呢?

选A:look through
仔细检查……
look your homework through = look through your homework
look for 寻找
look at 注视,看着
look up 向上看,改善