Mr Black decided to give up his farm and devote all his time to those children living on the streets.
A. help
B. helping
C. be helping
D. being helped
网友回答
A. help
(答案→)B. helping
C. be helping
D. being helped
解析：考查动名词用法。本题的固定词组devote one’s time to sth/doing sth致力于做某事；句意：布莱克先生决定放弃他的农场，把所有的时间都花在了帮助那些生活在街上的孩子们身上。句中的to是介词，后面接动名词的形式。故B正确。