单选题After operation, we should stop the electric motor.（）A操作完后，我们要发动电动机。B操作完之前，我们要关掉电动机。C操作之前，我们要发动电动机。D操作完后，我们要关掉电动机。
单选题
After operation, we should stop the electric motor.（）
A
操作完后，我们要发动电动机。
B
操作完之前，我们要关掉电动机。
C
操作之前，我们要发动电动机。
D
操作完后，我们要关掉电动机。
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