______either by cooling or by depriving the fire of oxygen, and most do both.

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问题 ______either by cooling or by depriving the fire of oxygen, and most do both.

选项 A、Working fire extinguishers
B、Fire extinguishers that work
C、Fire extinguishers work
D、The work of fire extinguishers

答案C

解析 本题考查句子成分。分析句子成分可知,句子缺少主语和谓语,只有[C]项为主谓结构,故为答案。[A]项缺少谓语;[B]项that多余;[D]项缺少谓语。
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