Looking on the internet deeply has found these results:

The work has been completed is the most popular phrase on the web.

The work had been completed 15,870 results on the web	The work has been completed 11,750,000 results on the web More popular!
Some examples and use cases from the internet:	Some examples and use cases from the internet:
Violation: Mr. Eikel signed and sealed engineering work certifying that the work had been completed as designed which was incorrect and thus misleading. �virtually completed� that the work had been completed in almost all respects and only minor ministerial detail remained to be performed. On that basis, it can be�... completed, The work had been completed before I arrived. completed, The work has been almost completed. completed, The work must be completed by�... sale of the plans to the land owner, that the "work" had been completed. But we think this type of reasoning would be an evasion of the intent and purpose of�...	It doesn't look like this phrase is very popular! The search could not find any examples on the internet.

The work had been completed

15,870 results on the web

The work has been completed

11,750,000 results on the web

More popular!

Violation: Mr. Eikel signed and sealed engineering work certifying that the work had been completed as designed which was incorrect and thus misleading.
�virtually completed� that the work had been completed in almost all respects and only minor ministerial detail remained to be performed. On that basis, it can be�...
completed, The work had been completed before I arrived. completed, The work has been almost completed. completed, The work must be completed by�...
sale of the plans to the land owner, that the "work" had been completed. But we think this type of reasoning would be an evasion of the intent and purpose of�...

It doesn't look like this phrase is very popular! The search could not find any examples on the internet.