Her brother while he his big horse and had his leg broken.A. fell; was ridingB. fell; rid

问题补充：

Her brother while he his big horse and had his leg broken.

A. fell; was riding

B. fell; ride

C. had fallen; was riding

D. had fell; rode

答案：

(答案→)A. fell; was riding

B. fell; ride

C. had fallen; was riding

D. had fell; rode

解析：while he was riding给出一个表示一段时间的状语,主句表示在此期间发生的动作行为.