Some cities have passed laws that allow coal and oil______only if their sulfur content is low.

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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 非谓语动词题。allow sb.to sth. :允许某人做某事,是固定搭配。 coal,oil和burn之间是逻辑上的动宾关系,因此应用动词不定式的被动式。故选D。
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