I think you can help a donation or doing some voluntary work.A. to makeB. by makingC. for

问题补充：

I think you can help a donation or doing some voluntary work.

A. to make

B. by making

C. for making

D. with making

答案：

A. to make

(答案→)B. by making

C. for making

D. with making

解析：考查介词短语。句意“我认为你可以通过捐赠或做一些志愿工作来（提供）帮助。”by是介词，意为“通过”。故选B。