expect请教

Question

expect运行的时候不能有按到回车？

脚本如

#!/usr/bin/expect  

set timeout 30     
spawn bash  centos7_client.sh    
expect
 {
 "sharon@192.168.27.156's password:" {send "pwd\r" ; exp_continue }  }   


expect "sftp>"     
send "put -r /home/xu/Documents/scripts/centos7  /home/sharon/Docuemnts/scripts \r"   
interact

运行中最早有一个确认是否覆盖的提示，我"y/n"
结果立马自己给我输入了
put -r /home/xu/Documents/scripts/centos7 /home/sharon/Docuemnts/scripts

这什么操作，我完全一脸懵逼。