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"been strengthened" is correct and usable in written English.
You can use it when you want to describe a situation in which something has been made more secure or reliable. For example: "The regulations have been strengthened to ensure greater consumer protection."
Exact(56)
Self regulation has already been strengthened.
But they have been strengthened.
Cockpit doors on aircraft have been strengthened.
"Israel's strategic deterrence has been strengthened".
"Unfortunately, President Obama's credibility hasn't been strengthened".
I don't think Misha's position has been strengthened politically.
The hateful will have been strengthened by our decision.
"The bond of the alliance has been strengthened".
In the past thirty years, copyright laws have been strengthened.
And now Jeremy Corbyn's leadership has been strengthened.
1.36pm @emmaca Funding for rural touring has actually been strengthened.
Write better and faster with AI suggestions while staying true to your unique style.
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