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.

admin2013-01-03  13
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
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