_____ on the top of the hill is a monument, dating back to hundreds of years ago.

A．Having stood

B．Standing

C．Being stood

D．Having been stood

[说明] 编写程序，把从键盘上输入的一批整数(以-1作为终止输入的标志)保存到文本文件“a: xxk1. dat”中。
(1)
# include ＜fstream. h ＞
# include ＜ stdlib. h ＞
void main ( )
(2)
if ( ! four)
cerr ＜ ＜“文件没有找开!” ＜ ＜end1;
exit (1);

int x;
cin ＞ ＞x;
while( (3) )
(4)
cin＞ ＞x;

(5)