you should prevent such a silly mistake____againA occurring B to occur C to be occured选A 为什么
问题描述：
you should prevent such a silly mistake____again
A occurring B to occur C to be occured
选A 为什么
答
prevent （from）doing sth。
答
prevent sth (from)doing
避免 发生
固定短语
所以动词要用ing形式
答
A prevent sth from+动名词，在主动语态中可以省略from
答
you should prevent such a silly mistake_occurring___again
这里是个固定短语，prevent sth from doing sth from 一般省略
答
prevent sth (from)doing
避免 发生
答
因为是一个固定搭配。
prevent doing sth/not doing sth