Which code， inserted at line 15， creates an instance of the Point class defined in Line？（） 
- A、Point p = new Point（）；
- B、Line.Point p = new Line.Point（）；
- C、The Point class cannot be instatiated at line 15.
- D、Line l = new Line（）； l.Point p = new l.Point（）；
正确答案:B
答案解析:有
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