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 本题为单词用法题。动词allow的用法为allow somebody to do something或者allowsomething to be done。所以本题答案为D)。句意为“有些城市通过法律，只允许硫含量低的煤或者油用来燃烧”。
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