If you ______ earlier, you ________ him.

A．came; would meet

B．had come; would have met

C．had come; would meet

D．would come; met

已经int DBL(int n){return n+n;}和long DBL(long n){return n+n＞是一个函数模板的两个实例，则该函数模板的定义是______。