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单选题
现有:   public class Pet()  public class Cat extends Pet{)      执行代码  Cat c- new Cat();      Pet p=  (Pet)c;  后下列哪项是正确的?()
A

 Pet p=(Pet)c运行错误

B

 Pet p=(Pet)c编译错误

C

 Pet p= (Pet)c止常执行

D

以上都不对


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