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The phrase 'had been working' is correct and can be used in written English.
It is the past perfect progressive tense, which is used to talk about an action that was in progress before something else happened. For example, "They had been working hard all morning before they stopped for lunch."
Exact(60)
Clearly the original mission had been working.
Some had been working since before sunrise.
We had been working with another artist.
I had been working all night.
In practice, nothing much had been working.
"I had been working a lot lately".
"It had been working all night.
Merrill had been working on the C.D.O.
8 team had been working toward.
SPEER: Those workers had been working on the Atlantic Wall.
He had been working with them quite assiduously.
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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