Miss Gao isn’t at home. She          to the station to meet her friends.

A．go

B．has been

C．will go

D．has gone.

有如下程序： #include＜iostream＞ using namespace std; class Con { char ID; public: Con():ID(’A’) { cout＜＜1;} Con(char ID) :ID(ID) { cout＜＜2;} Con(Con& c):ID(c.getID()) {cout＜＜3; } char get1D()const{return ID;} }; void show(Con c){ cout＜＜c.getID();} int main() { Con c1; show(c1); Con c2(’B’); show(c2); return 0; } 执行上面程序的输出是______。