By local doctors and nurses, we hope more people.
A. train, help
B. training, helping
C. training, to help
D. train, helping
网友回答
A. train, help
B. training, helping
(答案→)C. training, to help
D. train, helping
解析：by是通过的意思，后面接名词或相当于名词的动名词短语，表示通过某种方式。hope后面要接带to的不定式。