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:

答案:123