When children start smoking they don’t realize that they are risking their health.A. to d

问题补充：

When children start smoking, they don’t realize that they are risking their health.

A. to damage

B. damaging

C. to be damage

D. being damaged

答案：

A. to damage

(答案→)B. damaging

C. to be damage

D. being damaged

解析：risk用作动词, 后接动名词作宾语, 而不接不定式, 意思为 “冒着……的风险”。故答案为B。