2. 专升本
  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 句意：一些城市已通过立法：只有当煤和石油中硫黄的含量低时，才允许其作为燃料使用。非谓语动词题。allow sb．to do 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，因此用动词不定式的被动式。
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