_______he was laid off last year ______ how serious the economic crisis was.

A．Not until…he realized

B． It was not until… when he realized

C．It is not until…that did he realize

D．It was not until …that he realized

以下选项中，与我国基本国情相符的是

①社会生产力水平还比较低         ②科学技术水平和民族文化素质比较高

③人民行使当家作主的权力         ④社会主义具体制度还不完善

A．①②④

B．①②③

C．①③④

D．②③④