标题: PP第一组语法题一道求解 [打印本页] 作者: agathagu 时间: 2003-7-20 13:30 标题: PP第一组语法题一道求解 ______either by cooling or by depriving the fire of oxygen,and most do both。
A Working fire extinguishers B Fire extingusihers that work C Fire extinguishers work D The works of fire extingusihers作者: Diana 时间: 2003-7-20 14:34
C。 句中缺少谓语动词,只有C中的work可以作为谓语。