----_____he dropped out of school?

----His family has run into financial difficulties.

A．Why was it that

B．Why was that

C．Why was that it

D．Why was it

我国现阶段实行公有制为主体、多种所有制经济共同发展的基本经济制度的根本原因是（）（）

A.生产资料公有制是社会主义的根本经济特征

B.适合生产关系一定要适应生产力发展状况的规律

C.非公有制经济是社会主义市场经济的重要组成部分

D.改革开放以来，公有制经济和非公有制经济都迅速发展