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

游客2024-01-15  21

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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