at which,in which,on which,for which,by which,from which 分别等价于when where里的什么还有to which 一些高中常见的欢迎补充

问题描述:

at which,in which,on which,for which,by which,from which 分别等价于when where里的什么
还有to which 一些高中常见的欢迎补充