【单选题】
A switch(w) {case 1.0: printf( "*
"); case 2.0: printf("**
"); }
B switch(a) {case 1 printf( "*
"); case 2 printf("**
"); }
C switch(b) {case 1: printf( "*
"); default: printf ("
"); case 1+2: printf("**
"); }
D switch(a+b); {case 1: printf( "*
"); case 2: printf("**
"); default: printf ("
"); }
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