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 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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