在公共建筑室外空间环境设计中，建筑与室外环境的关系，不仅仅是利用环境的关系，而是室外空间环境不可分割的一部分，甚至可以是带动全局的（）。

In each person’s life there are three stages. When one was young, people said, "He will do something." As he grew older and did nothing, they said, "He could do something if he found himself." When he was white-haired, people said of him, "He might do something if he could try anything."

A．He should have done something if he has tried something

B．He would have done something if he should have tried anything

C．He might do something if he would try something.

D．He might have done something if he had tried anything