make a contribution为什么后面加to doing

make a contribution为什么后面加to doing make a contribution to .do还是doing? make a contribution to do sth 和make a contribution to doing make a great contribution to do还是to doing? make a contribution to跟动词是用do还是doing?为什么? make a contribution to 为什么has made a great contribution to preventing?为什么tO后面可以加ING make a contribution to 造句 make contribution to contribution要加s吗 make a contribution to中的contribution可换成devotion吗? make a contribution to中to后面的作什么成分 make a difference后面到底是加to do还是加doing?