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对于文件"d:\abc\x.txt",若实现读该文件的内容,需要创建扫描器对象,其正确语句为() A. File f=new File("d:\\abc\\x.txt"); Scanner cin=new Scanner(f); B. File f=new File("d:\abc\x.txt"); Scanner cin=new Scanner(f); C. File f=new File("d:/abc/x.txt"); Scanner cin=new Scanner(f); D. File f=new File("d://abc//x.txt"); Scanner cin=new Scanner(f);