急,Mr Brown isn'there.He_the post office Awent to B has gone to C has been to为什么啊 has been 与 has gone有什么区别

急,Mr Brown isn'there.He_the post office Awent to B has gone to C has been to
为什么啊 has been 与 has gone有什么区别

B 去了某处
has been to 是去过某地 已经回来了
has gone to 是去了某地 或者在某地 或者在途中 反正不在说话的地方