新概念二册第79课的一句：The police had been told that a bomb

新概念二册第79课的一句：The police had been told that a bomb

第二个用过去完成时是没有疑问的，第一个在一般情况下用一般过去时，但这里是和
when the plane suddenly turned round and flew back to the airport. While we were waiting to land, a flight attendant told us to keep calm and to get off the plane quietly as soon as it had touched down.里面的动作相比，turned round and flew back, told us to keep calm and to get off the plane
被告知是发生在这些动作前。追问已经蒙圈。anyway，thank you.

那就是跟前文作比较。这两件事都发生在前文发生之前。追问说全点啊，大哥追答你把前面几句发一下呢。课文我背不出来啊。