If the machine makes a mistake -- ____ rarely happens -- it gives a warning in t
题型：不详难度：来源：
| If the machine makes a mistake -- ____ rarely happens -- it gives a warning in the form of a red light. |
答案
| B |
解析
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。
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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