有如下程序:#include<iostream>;usingnamespacestd;classONE{
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有如下程序:#include<iostream>;usingnamespacestd;classONE{
intc;public:
ONE():c(0){cout<<1;}
ONE(intn):c(n){cout<<2;}
};classTWO{
ONEonel;ONEone2;public:
TWO(intm):one2(m){cout<<3;}
};intmain(){
TWOt(4);return0;}运行时的输出结果是()
A.3
B.23
C.123
D.213
参考答案: