有如下程序 main() { int x=1,a=0,b=0; switch(x){ case 0: b++; case 1: a++; case 2: a++;b++; } printf("a=%d,b=%d\n",a,b); } 该程序的输出结果是______。

A．a=2,b=1

B．a=1,b=1

C．a=1,b=0

D．a=2,b=2

You can't pass the test            you work hard.[ ]

A. if

B. after

C. when

D. unless