问题

The lower－level classes （known as subclasses or derived classes）（） state and behavior fr

The lower-level classes （known as subclasses or derived classes）（） state and behavior from the higher-level class （known as a super class or base class）.

A.request B.inherit C.invoke D.accept

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The lower－level classes （known as subclasses or derived classes） （） state and behavior fr

The lower－level classes （known as subclasses or derived classes）（） state and behavior fr