having been done的用法例句：

　　The work ( having been) done, he left the office.

　　做完工作后，他離開辦公室。

　　The paper introduces closed management of slab yard and some work having been done such as enriching the varieties of charging and optimizing the structure of charging.

　　介紹了電爐廠在廢鋼場(chǎng)地封閉管理，豐富爐料品種和優(yōu)化爐料結(jié)構(gòu)等方面所做的工作，證實(shí)了精料方針能顯著改善技經(jīng)指標(biāo)。

　　He asked whom I'd told about his having been away

　　他問(wèn)我把他曾離開的消息告訴過(guò)誰(shuí)。

　　We are taking action, having been in receipt of a letter from him

　　收到他的信之后我們正在采取行動(dòng)。