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【单选题】
A class design requires that a particular member variable must be accesible for direct access by any subclasses of this class, otherwise not by classes which are not members of the same package. What should be done to achieve this? （ ）A.
The variable should be marked public
B.
The variable should be marked private
C.
The variable should be marked protected
D.
The variable should have no special access modifier
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