A sentence has been given in Active/Passive voice. Out of the four alternatives suggested below, select the one which best expresses the same sentence in Passive/Active voice. 
 

We have already done the work. 

 The work has already been done by us.

The work has already been done by us.

Explanation:

• Already the work has been done by us.: This passive construction changes the word order ("already" should be placed before "been") and doesn't accurately convey the original sentence.
• The work has already been done by us.: This passive construction correctly maintains the original meaning and reverses the subject and object while using the appropriate verb tense.
• The work had been already done by us.: This passive construction introduces "had been" which changes the tense from present perfect ("has already been done") to past perfect ("had been already done").
• The work is already done by us.: This active construction changes the tense ("has been done" to "is done") and doesn't accurately convey the original sentence.