— Did you remember to give Mary the money you owed her ?

—Yes.I gave it to her _______ I saw her.

A．while

B．the moment

C．suddenly

D．once

[说明]
下面Application程序用while循环从键盘读入字符，记录输入的字符数并输出读入的字符，当输入字符“0”时结束while循环，同时结束程序。
[Java程序]
import java.io.*;
public class ContinuateInput
public (1) void main(String[] args) (2) IOException
int ch;
int counter=0;
System.out .println("请输入字符(输入0结束)");
while ((char) (ch=System.in. (3) ) != ’0’)
counter++;
System.out .println (( (4) )ch) ;

System.out .println () ;
System.out.println ("counted "+counter+" total bytes. ") ;
System.out . (5) ;