Some cities have passed laws that allow coal and oil______only if their sulfur c

游客2024-01-16  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 本题考查动词allow的用法。allow sb.to do sth.,“允许某人做某事”,所以A和C排除。煤和石油应该是被燃烧,应该用被动语态,故D为正确答案。
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