八上英语
问题描述：
八上英语
They ___ ___ ___ when they saw me.
当他们看到我时忍不住笑了起来.
横线上应填什么.
当when放在句首时,从句用什么时态,主句用什么时态?
答
They couldn't___ _help__ __laughing_ when they saw me.
can't help doing sth .忍不住做某事,can't help 不能分开翻译成
when在的话前后时态保持一致!