4个回答
一般是 for a long time 就可以了，或者是long time ago,
你的语法还真混乱，帮你一下：
for 表示一段时间，一般用完成时
1. i have been a teacher for 2 years.
2. she has been living in london for 5 years.
ago 表示一个时间点，一般用过去式：
1. she moved to manchester three weeks ago .
2. he started to watch tv five hours ago.
至于你的几句话，帮你改一下：
he has gone for 2 days.
he has gone to shanghai for 2 days.
he went to shanghai 2 days ago
he has gone to beijing for two days.
he has left beijing for two days.
那____ a long time ago
这个横线上应填什么？
请把整个句子都写出来可以吗？
不可以连用，for一般跟时间段，ago是跟过去时。
你那句话应该是 before a long time ago(在很长时间以前）。