社会形态
参考答案：一定历史发展阶段上以一定的生产关系为基础的社会。是经济基础和上层建筑的具体的历史的统一。
It’s those _____ experience ups and downs with us_____ are real friends.
A．that, that
B．who, that
C．that, which
D．that, who
0hngren线
