It's been a pleasure working with you.
跟你工作的這段日子我非常愉快。

It's been a pleasure..
It's been a pleasure to do/doing
...是我的慶幸/讓我感到非常開心
It's been a pleasure to be here.
能夠來到這里是我的榮幸。
It's been a pleasure to be invited to attend this meeting.
能夠被邀請來參加這個會議是我的榮幸。
It's been a pleasure knowing you.
能夠認識你是我的榮幸。

A:I have applied for a transfer.
我已經申請調職。
B:Really?Do you mean that you are leaving?
真的嗎？你的意思是你要離職嗎？
A:Yes,I think it's time to move on.I've already been here too long.
是的。是該有所改變了。我在這兒待了太久了。
B:Where do you want to go?
你想到哪兒去呢？
A:Well.I want to be transferred to the Shanghai office.
我想調任到上海辦事處。
B:I will miss you.But anyway I wish you every success at your new post.
我會想你的。但不管怎么樣。祝你在新的崗位上一切順利。
A:Thanks.It's been a pleasure working with you.
謝謝。跟你工作的這段日子我非常愉快。