If the machine makes a mistake -- ____ rarely happens -- it gives a warning in the form of a red light.
A．that
B．which
C．as
D．what
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◎ 解析
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◎ 知识点
根据n多题专家分析，试题“If the machine makes a mistake -- ____ rarely happens -- it gives a warning in the form of a red light.A．thatB．whichC．asD．what…”主要考查了你对 【限制性定语从句】，【非限制性定语从句】 等知识点的理解和应用能力。关于这些知识点的“档案”，你可以点击相应的链接进行查看和学习。
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