大量艰苦的工作一直在幕后进行着。

A lot of hard work has been going on ___behind ___the ___scenes.

她知道那些正在幕后进行的讨论。

She knew about the discussions that were happening ___behind ___the ___scenes.

早在官方宣布之前，关键的谈判就在幕后进行了。

The crucial negotiations took place ___behind ___the ___scenes long before the official announcement.