2. 外语
  3. 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.

admin2012-01-27  72
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。
转载请注明原文地址:https://kaotiyun.com/show/tZ6O777K
0

考博英语

相关试题推荐
随机试题
最新回复(0)