To explain the cause is a legal obligation of administrative organ, the administrative subject should explain the cause of the unfavourable executive decision having been done by them.

说明理由是行政机关的法定义务，行政主体应当对其做出的，对当事人不利的行政决定说明理由。

youdao

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

做完工作后，他离开办公室。

youdao

French striker David Ngog scored Liverpool's early winner, but Rafael Benitez's side struggled to produce a convincing display, the damage having been done in two games against Lyon that cost them four points.

CNN: Liverpool crash out despite victory

She told police she had been in Clark's house after Mrs Coulter was attacked and described how he had spoken about Mrs Coulter having "been done".

BBC: Derek Clark jailed for attempting to murder Mary Coulter

Michael Philpott told jurors his family had been "having the bathroom done" but he did wash his face with water.

BBC: Mick Philpott