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'has been working since' is correct and usable in written English.
You can use it to describe an action that has been taking place for a certain amount of time in the past. For example: She has been working since she graduated from college five years ago.
Exact(53)
SILEYE-2 was placed on MIR in 1997 and has been working since then.
The Training Factory for the Electronics Industry has been working since 1999.
The Ass. Liberté has been working since 1979 with affective, sexual, alimentary, internet and drugs addictions.
She's 15 years old and has been working since she was 14. She's from Belarus.
It has been working since the days of the fatwa against Salman Rushdie.
"It's a very long shift," says Mr. Johnson, who has been working since 4 a.m.
Similar(7)
The F.A.A. has been working since 1994 to develop new standards for limiting pilot duty periods.
He has been working since 1981 and sells mainly through fairs and his website, brettpayne.com.com
Beato, who sat out much of this week with an inflamed rotator cuff, has been working since last year on developing more consistency and control.
At the American Ref-Fuel plant in Westbury, a radiation detector has been working since 1990, a year after the first loads of garbage were received there.
He has been working since last year to gain permits to build Encinal Tower, a 56-story, $600 million mixed-use tower, which would be the city's tallest.
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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