The girl devoted all her spare time she had others.A. to helpB. helpedC. to helpingD. hel

问题补充：

The girl devoted all her spare time she had others.

A. to help

B. helped

C. to helping

D. help

答案：

A. to help

B. helped

(答案→)C. to helping

D. help

解析：本句的结构是：devote oneself/energy/time to doing sth.