下列ABCD注释标注的哪行代码有错误? import java.io.*; public class Helo { public static void main(String args[]) { File file = new File("hello. txt");// A long m = file.length();// B try { FileReader in = new FileReader(file); BufferedReader bufferRead =new BufferedReader (file) ;//C FileWriter out = new FileWriter(file); // D } catch (IOException exp) { } } }