All the citizens strongly insist those found harmful advertisements in the street should be punished strictly．
A. putting up
B. being put up
C. put up
D. to be putting up
网友回答
(答案→)A. putting up
B. being put up
C. put up
D. to be putting up
解析：本题考查非谓语动词。found those putting up harmful advertisements其中putting up作补语，选A。