I am a League member. I volunteer my time others. A. helpB. to helpC. helpingD. helped

问题补充：

I am a League member. I volunteer my time others.

A. help

B. to help

C. helping

D. helped

答案：

A. help

(答案→)B. to help

C. helping

D. helped

解析：句意：我是一个团员。我自愿利用自己的时间来帮助别人。动词不定式表示具体的将要进行的动作，volunteer后面一般接带to的动词不定式做宾语补足语，故选B。