Only when ________ the tea-house ________ it was the same place he had been in last year. [      ]

A. he reached ; did he realize    

B. did he reach ; did he realize

C. he reached ; realized he      

D. he reached ; had he realized    

行政组织结构是指行政组织各要素的( )

A．对立统一关系

B．排列组合方式

C．辩证统一关系

D．辩证组合方式