he's got so much energy,this is one class you do not fall asleep in!后面为什么要接介词in?
问题描述：
he's got so much energy,this is one class you do not fall asleep in!后面为什么要接介词in?
答
you do not fall asleep in是class的后置定语,一般说in the class,所以in不能省略如果变成定语从句，是不是In which you do not fall asleep,它省略了关系代词which?是的，非常正确