Some cities have passed laws that allow coal and oil ______ only if their sulfur

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问题 Some cities have passed laws that allow coal and oil ______ only if their sulfur content is low.

选项 A、burning
B、to burn
C、being burned
D、to be burned

答案 D

解析本题考查的是allow sth. to be done，主动形式是allow sb. to do sth. ，此处是允许人们在硫含量低的情况下燃烧煤和石油，所以它们是被燃烧，用被动形式。

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