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

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 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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