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[单选题]

有下列程序: #include <stdio.h> main() { int x=1,y=0,a=0,b=0; switch(x) { case 1: switch(y) { case 0:a++;break; case 1:b++;break; } case 2: a++;b++;break; case 3: a++;b++; } printf("a=%d,b=%d\n",a,B) ; } 程序的运行结果是()。

A.a=1,b=0

B.a=2,b=2

C.a=1,b=1

D.a=2,b=1

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