问题描述：
[单选]
当一个带电体的极性与另一带电体相反时，人们就说它们之间存在电位差。（）
A．When one of the charged bodies has a polarity opposite to the other, there is said to be a difference of potential between them.
B．When one of the charged bodies has a polarity opposite to the other, it is said to be a difference of potential between them.
C．When a charged body has the opposite polarity from another electric body, a potential difference is said to exist between them.
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