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The phrase 'had been learned' is correct and usable in written English.
It is used in the past perfect tense when referring to actions that happened in the past before another action in the past. For example: "By the time the test came around, all the material that had been learned was put to good use."
Exact(44)
Hu only said lessons had been learned.
Šefčovič argued lessons had been learned.
"I thought lessons had been learned, but obviously not".
And at least one lesson had been learned.
I naively thought the lesson had been learned.
A few weeks ago, it seemed that this lesson had been learned.
Similar(8)
In Kabul, a spokesman for the NATO-led International Security Assistance Force declined to comment on the Pakistani report, but stressed that hard lessons had been learned.
By contrast, Salesforce.com built on what had been learned in other organizations, but also adapted it to their own context.
Once the eight-arm maze had been learned to criterion, group differences were not apparent.
He said lessons had been learned and steps taken to protect patients in future.
No one would have died at Kent State if this lesson had been learned by the Ohio National Guard.
More suggestions(16)
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com