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- 单项选择题 Given：
Which change can you make to Target without affecting Client？（） A、Line 4 of class Target can be changed to return i++；
B、Line 2 of class Target can be changed to private int i = 1；
C、Line 3 of class Target can be changed to private int addOne（）{
D、Line 2 of class Target can be changed to private Integer i = 0；
- D
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