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。
The work (having been) done, he left the office.
做完工作后，他离开办公室。
The work (having been) done, he left the office.
做完工作后，他离开办公室。
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