有以下程序
#include <stdio.h>
main( ) { int a,b;
for (a=0; a<3; a++)
{ scanf("%d", &b);
switch(b)
{ default: printf("%d,", b++);
case 1: printf("%d,", b++);
case 2: printf("%d,", b++);
} } }
程序运行时输入：1 2 3<回车>，则输出结果是
A) 1,2,3,
B) 1,2,2,3,4,5,
C)1,2,3,2,3,3,
D)1,1,1,2,2,3
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