若有以下定义:float x; int a,b; 则正确的switch 语句是A) switch(x) B) switch(x){ case 1.0:printf("*\n"); { case 1,2:printf("*\n");case 2:printf("**\n") case 3:printf("**\n");} }C) switch(a+b) D) switch(a-b);{ case 1:printf("*\n") ; { case

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