0 "had been done" is used to explain that a activity was done before another activity. 02br 00it can't affect now! it is past. 02br 02br 00but,"has been done" can affect now.maybe its effects can still be continue 02br 02br 02br 00maybe my sentences are wrong 050010id6
2) It had been done two days ago. ->It was done two days ago (if particular time is mentioned you have to use past simple - except you are talking about past and want to emphasise something had been done before that time)