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【单选题】

Some cities have passed laws that allow coal and oil ______ only if their sulfur con- tent is low.
A．burning

B．to burn
C．being burned
D．to be burned
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根据网考网移动考试中心的统计，该试题：

2%的考友选择了A选项

11%的考友选择了B选项

9%的考友选择了C选项

78%的考友选择了D选项

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