2. 外语
  3. There is not a conductor ______ resists the flow of the electrical charges.

There is not a conductor ______ resists the flow of the electrical charges.

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问题 There is not a conductor ______ resists the flow of the electrical charges.
选项 A、which
B、but
C、that
D、it
答案B
解析 but作关系代词，用在否定词或具有否定意义的词后，引导定语从句，相当于who not或that not从而构成双重否定，如：There is no mother but loves her children．没有不爱自己孩子的母亲。
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