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【单选题】
已知MyInterface是一个接口,ClassA是实现了MyInterface的一个类,ClassB是ClassA的子类,则下列哪个语句是正确的?
A.
ClassB obj=new ClassA();
B.
MyInterface obj=new ClassB();
C.
ClassA obj=new MyInterface();
D.
MyInterface obj=new MyInterface();
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