(单选题)10: 下面程序的运行结果为_________。#include class A {public: A(){cout<<”1”;} ~A(){cout<<”2”;} }class B:public A { public: B(){cout<<”3”;} ~B(){cout<<”4”;} }void main() { B b; }
A: 1234
B: 1324
C: 1342
D: 3142
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