I really can't understand ____her like that .用why treat 还是you treating 为什么?

I really can't understand ____her like that .用why treat 还是you treating 为什么?
I really can't understand ____her like that .用why treat 还是you treating 为什么?

I really can't understand ____her like that .用why treat 还是you treating 为什么?
正确的答案是 you treating,加主语或者why to treat 不定式
因为动名词短语做宾语,而不是因为understand sb doing sth,不是词组,而其中的you 也可以换成your.