The whole path ______ electricity travels is known as a circuit.

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问题 The whole path ______ electricity travels is known as a circuit.

选项 A、which
B、along which
C、along with
D、in that

答案B

解析 本题考查定语从句。介词along有"沿着"的意思。当定语从句中的介词提前时,定语从句应由which(修饰表物名词)或 whom(修饰表人名词)引导。
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