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多項(xiàng)選擇題

Which two, independently, will allow Sub to compile?()

A.Change line 2 to:public int a;
B.Change line 2 to:protected int a;
C.Change line 13 to:public Sub(){this(5);}
D.Change line 13 to:public Sub(){super(5);}
E.Change line 13 to:public Sub(){super(a);}

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