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