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If the machine makes a mistake -- ____ rarely happens -- it gives a warning in the form of a red light.


  1. A.
    that
  2. B.
    which
  3. C.
    as
  4. D.
    what
B
试题分析:考查定语从句。本定语从句中which指代一句话的内容,在非限制性定语从句中做主语。That不能引导非限制性定语从句,as有正如的意思,what不是定语从句的引导词。句意:如果这个机器犯了错误,这很少发生,它就会以红色的灯光发出警报。故B正确。
考点:考查定语从句
点评:which可以指代一句话的内容,在定语从句中做主语等。要注意as有正如的意思,也可以引导非限制性定语从句。
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