If the machine makes a mistake -- ____ rarely happens -- it gives a warning in the form of a red light.
A．thatB．whichC．a(chǎn)sD．what
B

試題分析：考查定語從句。本定語從句中which指代一句話的內(nèi)容，在非限制性定語從句中做主語。That不能引導(dǎo)非限制性定語從句，as有正如的意思，what不是定語從句的引導(dǎo)詞。句意：如果這個(gè)機(jī)器犯了錯(cuò)誤，這很少發(fā)生，它就會(huì)以紅色的燈光發(fā)出警報(bào)。故B正確。
點(diǎn)評(píng)：which可以指代一句話的內(nèi)容，在定語從句中做主語等。要注意as有正如的意思，也可以引導(dǎo)非限制性定語從句。
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