问题补充:
March is a Civility month(文明礼貌月) in China. More and more young people
are trying to do all they can the elderly.
A. helped
B. to help
C. help
D. helps
答案:
A. helped
(答案→)B. to help
C. help
D. helps
解析:动词不定式可以用在谓语后面,表示一次性的动作,说明动作的方向目的等,此处帮助老人是他们做事的目的,所以选B,努力去做他们能做的来帮助老人们。