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單項(xiàng)選擇題

class A { 
public A() { 
System.out.println(“hello from a”); 
} 
} 
class B extends A { 
public B () { 
System.out.println(“hello from b”); 
super(); 
} 
} 
public class Test { 
public static void main(String args[]) { 
A a = new B(); 
} 
}  
What is the result when main is executed?()  

A. Compilation fails.
B. hello from a
C. hello from b
D. hello from b hello from a
E. hello from a hello from b

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