We consider some signs to stop people from smoking here.A. to set upB. to put upC. putti

问题补充：

We consider some signs to stop people from smoking here.

A. to set up

B. to put up

C. putting up

D. setting up

答案：

A. to set up

B. to put up

(答案→)C. putting up

D. setting up

解析：consider doing sth表示“考虑做某事”是固定用法，故应该排除AB；根据题干，本句的意思是“我们正考虑张贴一些标志阻止人们在这吸烟。”“张贴”是put up，而set up是“设立”的意思。所以本题选C。