While little Tony was climbing up a tree he fell off his leg.A. damagingB. hittingC. hurti

问题补充：

While little Tony was climbing up a tree he fell off,his leg.

A. damaging

B. hitting

C. hurting

D. striking

答案：

A. damaging

B. hitting

(答案→)C. hurting

D. striking

解析：句意：当小托尼在爬树时，他掉了下来，摔坏了他的腿。这里是非谓语动词，he与hurt之间是主动关系，因为空格后有宾语，damage损害；hit袭击；hurt使受伤；strike打击。根据句意故选C。