问题补充：
I think the lives of children in poor areas greatly by this project.
A. improve
B. improved
C. can improve
D. can be improved
答案：
A. improve
B. improved
C. can improve
(答案→)D. can be improved
解析：考查语态.句意:通过这个工程,我认为在贫困地区的孩子们的生活能够大大的得到提高.结合语境可知从句主语the lives of children是动作对象,故用被动语态.选D.
