This is one of the means __the electric energy is conducted

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This is one of the means __the electric energy is conducted from one place to anoter.
A.by which B.by that C.through which D.through that

A.by which 为正确选项.
本题考点：1,by means 通过.途径,固定短语；2,定语从句的介词前置,关系代词只能用which.

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