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13、1=formal 2=informal 答案填写数字1或2 Greetings like Hi or Hey are often used in ________ letters.


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考题 单选题class Guy { String greet() { return "hi "; } }  class Cowboy extends Guy { String greet() { return "howdy "; } }  class Wrangler extends Cowboy { String greet() { return "ouch! "; } }  class Greetings2 {  public static void main(String [] args) {  Guy g = new Wrangler();  Guy g2 = new Cowboy();  Wrangler w2 = new Wrangler();  System.out.print(g.greet()+g2.greet()+w2.greet());  }  }  结果是什么?()A hi hi ouch!B hi howdy ouch!C ouch! howdy ouch!D 编译失败