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Which of the following fragments might cause errors?()    

  • A、 String s = "Gone with the wind";String t = " good ";String k = s + t;
  • B、 String s = "Gone with the wind";String t;t = s[3] + "one";
  • C、 String s = "Gone with the wind";String standard = s.toUpperCase();
  • D、 String s = "home directory";String t = s - "directory";

参考答案

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