有以下类定义
using namespace std;
class B1{
int b1;
public:
B1(int i){b1=i; cout<<b1; }
~B1( ){ cout<<"#1"; }
};
class B2 {
int b2;
public:
B2( ){b2=0; cout<<"*2"; }
~B2( ){ cout<<"#2"; }
};
class C: virtual public B1,public B2 {
int j;
public:
C(int a,int b,int c):B1(a),_______ ,j(c){cout<<"*3";}
~C( ){ cout<<"#3"; }
private:
B1 c1;
B2 c2;};
请为横线处选择合适的程序将派生类C的构造函数补充完整( )