2. 考研
  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.

admin2005-07-06  117
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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