I always help my sister_______ her history A to B with C for D of

问题描述:

I always help my sister_______ her history A to B with C for D of

B with
是 help sb with sth这个句型.帮助某人做某事.到底是哪个选B with为什么help sb with sth这个句型是固定用法。那上面这个人为什么选aa 是 help sb to do sth 这种用法。不适合这句。