It was _____ back home after the experiment. [ ]

A. not until midnight did he go

B. until midnight that he didn't go

C. not until midnight that he went

D. until midnight when he didn't go

下列哪部标准或规范中的部分条文为强制性国家标准( )

A．《城市规划基本术语标准》
B．《城市用地分类与规划建设用地标准》
C．《城市规划工程地质勘察规范》
D．《城市居住区规划设计规范》