(The first) electric lamp had two carbon rods (from which) vapor (served) to conduct the current (across) the gap.

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问题 (The first) electric lamp had two carbon rods (from which) vapor (served) to conduct the current (across) the gap.

选项 A、The first
B、from which
C、served
D、across

答案B

解析 应将from which改为by which。
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