设变量已正确定义,以下( )与其它switch语句不等价。 A. switch(choice){ case 1: price = 3.0; break; case 2: price = 2.5; break; case 3: price = 4.0; break; case 4: price = 3.5; break; default: price = 0.0; break; } B. switch(choice){ default: price = 0.0; break; case 4: price = 3.5; break; case 3: price = 4.0; break; case 2: price = 2.5; break; case 1: price = 3.0; break; } C. switch(choice){ case 1: price = 3.0; break; case 2: price = 2.5; break; case 3: price = 4.0; break; case 4: price = 3.5; break; } D. price = 0.0; switch(choice){ case 1: price = 3.0; break; case 2: price = 2.5; break; case 3: price = 4.0; break; case 4: price = 3.5; break; }