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实现以读的方式打开D盘文件f1.txt的语句是
A、ifstream infile("D:\f1.txt",ios::in);
B、ofstream outfile("D:\f1.txt",ios::out);
C、ifstream infile("D:\\f1.txt",ios::in);
D、ofstream outfile("D:\\f1,txt",ios::out);
【正确答案】：C