问题
选择题
This is one of the means ____t he electic energy is conducted from one place to another.
A．by which
B．by that
C．through which
D．through that
答案
答案：A
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This is one of the means ____t he electic energy is conducted from one place to another.
A．by which
B．by that
C．through which
D．through that
答案：A