Mr. Black decided to give up his farm and devoted all his time tothose children living on

问题补充：

Mr. Black decided to give up his farm and devoted all his time tothose children living on the street.

A. help

B. being helped

C. be helping

D. helping

答案：

A. help

B. being helped

C. be helping

(答案→)D. helping

解析：考查非谓语动词.句意:布莱克决定放弃他的农场,把所有时间投入到这些生活在大街上的孩子身上.本句中to是介词,后面接名词或者动名词做宾语,选项B表示被动动作,故选D.