"It's been a long time" 是一种常见的表达方式，意思是“好久不见”。这种用法在英语中非常普遍，来源于日常口语。
例句1:
It's been a long time since we last saw each other.
这是我们最后一次见面已经很久了。
例句2:
"Wow, it's been a long time since I've been here"
哇，我已经很久没来这里了。
例句3:
"How have you been? It's been a long time since we last spoke."
你过得怎么样？我们最后一次聊天已经很久了。