This is one of the happiest days ____ spent in my life.

A．that have ever been

B．that has never been

C．which was ever

D．that had been

以下（）是朝阳市的国家森林公园。

A.陨石山国家森林公园

B.大黑山国家森林公园

C.孤山国家森林公园

D.天桥沟国家森林公园

E.凤凰山国家森林公园