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单选题
Most of the switches you use to control the electrical power system are on the electrical system control panel.
A
You can use most of the switches to control the electrical power system.
B
You can find most of the switches that you use to control the electrical power system on the electrical system control panel.
C
There are some switches for electrical power system on the electrical system control panel.
答案解析
正确答案：B
