问题补充：
We in the office.
A. are not permitted smoke
B. are not permitted smoking
C. don’t permit smoking
D. don’t permit to smoke
答案：
A. are not permitted smoke
B. are not permitted smoking
(答案→)C. don’t permit smoking
D. don’t permit to smoke
解析：考查短语: permit sb to do 允许某人做某事，permit doing 允许做某事，句意:我们不允许在办公室吸烟。permit的否定式应用助动词，所以选C。
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