once引导的从句,用什么时态例句Once he ______to do something ,no one can hold him back.A made up his mind B makes up his mind 还有关于 once 其他的用法也给我介绍一下,我已经知道答案了，是 B makes up his mind只是不知道为什么请不知道的人不要乱答
问题描述：
once引导的从句,用什么时态
例句
Once he ______to do something ,no one can hold him back.
A made up his mind B makes up his mind
还有关于 once 其他的用法也给我介绍一下,
我已经知道答案了，是 B makes up his mind
只是不知道为什么
请不知道的人不要乱答
答
made up his mind
用虚拟语气 所以用过去式
答
选B.Once的用法1.once用作连词时,意为“一旦……就……”,用于连接时间状语从句,相当于as soon as.如：Once you start,you will never give up.一旦你开始了,你就不要放弃.Once you begin to read it,you will like ...