【单选题】

is forbidden in the meeting-room but we are allowed in the room for smokers.

A．Smoking, smoking
B．Smoking, to smoke
C．To smoke, smoking
D．To smoke, to smoke

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根据网考网移动考试中心的统计，该试题：

0%的考友选择了A选项

79%的考友选择了B选项

3%的考友选择了C选项

18%的考友选择了D选项

______ is forbidden in the meeting-room but we are allowed ______ in the room for smokers.