having been done的用法例句：
The work ( having been) done, he left the office.
做完工作后，他离开办公室。
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.
介绍了电炉厂在废钢场地封闭管理，丰富炉料品种和优化炉料结构等方面所做的工作，证实了精料方针能显著改善技经指标。
He asked whom I'd told about his having been away
他问我把他曾离开的消息告诉过谁。
We are taking action, having been in receipt of a letter from him
收到他的信之后我们正在采取行动。