—We don’t permit in our school. Would you please put your cigarette out?
—Forgive me. I didn’t know.
A. to smoking
B. to smoke
C. smoking
D. having smoked
网友回答
A. to smoking
B. to smoke
(答案→)C. smoking
D. having smoked
解析：考查非谓语动词。permit doing sth禁止做某事，根据句意故选C。