在以下,哪一行执行了装箱操作( ) public static void Main() { int i = 10; object obj = i; //Line:1 Console.WriteLine(“{0},{1}”,i,obj); //Line:2 int j = (int)obj; //Line:3 Console.WriteLine(“{0},{1}”,j,obj); //Line:4 }
A.
Line:1
B.
Line:2
C.
Line:3
D.
Line:4
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