单选题下列程序错误的原因是（） Sealed class SealedClass{ } Class Derived：SealedClass{ }A SealedClass类不能被继承B 没有Main（）入口C SealedClass没有被实例化D 以上皆是
单选题
下列程序错误的原因是（） Sealed class SealedClass{ } Class Derived：SealedClass{ }
A
SealedClass类不能被继承
B
没有Main（）入口
C
SealedClass没有被实例化
D
以上皆是
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