We should do all we can the children who lost the chance to go to school.
A. help
B. to help
C. helping
D. to be helping
网友回答
A. help
(答案→)B. to help
C. helping
D. to be helping
解析：本句的含义我们应该做我们能做的来帮助那些失去机会上学的孩子们，表示做某事的目的，可用动词不定式短语to do sth来作目的状语，故本题选B。