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what is the difference between' has been done 'and 'had been done'.
Comments 
Example:

Q. Has the job been done?
A. 1) It has been done already.
A. 2) It had been done two days ago.
"had been done" is used to explain that a activity was done before another activity.
it can't affect now! it is past.

but,"has been done" can affect now.maybe its effects can still be continue

maybe my sentences are wrong Emotion: sad
Students: Are you brave enough to let our tutors analyse your pronunciation?
The 2nd one is correct.
wrong answer...

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)