With the introduction of the electronic computer, there is no complicated proble

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问题 With the introduction of the electronic computer, there is no complicated problem can be solved in a few hours.

选项 A、but
B、which
C、that
D、what

答案 A

解析 but在英语句子中可用作关系代词，引导定语从句。但应特别注意but虽然形式上是肯定的，意义上却是否定的。这正是but和其它关系代词(who，that，which等)不同之处。

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