The harm the modern farming methods have done the countryside is considerable.
A. on
B. at
C. to
D. for
网友回答
A. on
B. at
(答案→)C. to
D. for
解析： 考查短语：do harm to 对什么有危害，句意：现代农耕的方法对乡村的危害是值得考虑的。The harm为先行词，the modern farming methods have done to是定语从句，中间省略了关系代词that/which,故选c。