定语从句this is the one of means___the electic energy is conducted from one place to another.
问题描述：
定语从句this is the one of means___the electic energy is conducted from one place to another.
A.by which B,at which C,through which D,through that
为什么要用BY WHICH
答
by which
也可以填that,不过没有这个选项