看下句：--what’s paper used for?--It’s used for writing on.此处,为何用writing on而不用being written on?老师说两种均可,我认为writing on是表主动啊,不可以用在这里.

看下句：--what’s paper used for?--It’s used for writing on.此处,为何用writing on而不用being written on?老师说两种均可,我认为writing on是表主动啊,不可以用在这里.
看下句：
--what’s paper used for?
--It’s used for writing on.
此处,为何用writing on而不用being written on?
老师说两种均可,我认为writing on是表主动啊,不可以用在这里.

看下句：--what’s paper used for?--It’s used for writing on.此处,为何用writing on而不用being written on?老师说两种均可,我认为writing on是表主动啊,不可以用在这里.
be used for doing sth 表示被用来做某事 固定词组 楼主记住就好
希望能够帮到楼主