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非谓语动词的问题Somecitieshavepassedlawsthatallowcoalandoilonlyiftheirsulfurcontentislow.A.burningB.toburnC.beingburnedD.tobeburned我觉得首选是allow+doing形式,所以排除了B,D.然后是煤和石油被燃烧

题目详情
非谓语动词的问题
Some cities have passed laws that allow coal and oil ___only if their sulfur content is low.
A.burning B.to burn C.being burned D.to be burned
我觉得首选是allow+doing形式,所以排除了B,D.然后是煤和石油被燃烧了,所以我选了C.可正确答案是B.这是为什么呢,
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答案和解析
不定时可以表被动啊,又如:
book to read,water to drink,flower to water,