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    

书写函数时除（）函数外，都必须有圆括号。

A、宏代替函数

B、标准函数

C、自定义函数

D、字符操作函数