设有编号为1，2，3，4，5的五个球和编号为1，2，3，4，5的五个盒子，现将这五个球放入5个盒子内只有一个盒子空着，共有______种投放方法．

The teacher asked me ________.

A．where was I from

B．where I was from

C．what country I was come from

D．which country do you come from