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假定已定义变量int x,y;则下面正确的switch语句是( ) A. switch(x) { case 1.1: y++; case 2.1: y--; default: y*=y; } B. switch(x) { case ‘a’:y++; case ‘b’:y--; default:y*=y; } C. switch(x) { case 2: y++; case 1+1: y--; default:y*=y; } D. switch(x) { default: y*=y; case 1: y++; case 1+1: y--; }