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外语
The first electric lamp had two carbon rods from which vapor served to conduct the current across the gap.
The first electric lamp had two carbon rods from which vapor served to conduct the current across the gap.
admin
2012-01-27
42
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应改为by which。
解析
这里需要介词+关系词,按照语意,“在……周围,依赖……手段”用by。
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