what the soldiers does do good to our country?why use "does" after "soldiers"?

问题描述:

what the soldiers does do good to our country?
why use "does" after "soldiers"?

It is "does" that emphasize the following part...

士兵们对我们国家做出了什么样的贡献? does用在soldiers后面是因为把soldiers看成一个整体,是共同做的事情,而不是每个人做的乱七八糟的事情. do good是个词组,做出的贡献,does不能省略,并不是像一楼说的does作强调用.