【单选题】Some cities have passed laws that allow coal and oil______only if their sulfur content is low.
A.burning
B.to burn
C.being burned
D.to be burned
网考网参考答案:D
网考网解析:
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【单选题】Some cities have passed laws that allow coal and oil______only if their sulfur content is low.
A.burning
B.to burn
C.being burned
D.to be burned
网考网参考答案:D
网考网解析:
暂无解析
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