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"remained classified" is a grammatically correct phrase and can be used in written English.
For example: "The documents were declassified in 2020, but some information remained classified."
Exact(28)
Of those initially classified as having generalized pain, 85% remained classified having generalized pain [ 13].
The practice, which remained classified intelligence for several decades, has prompted widespread concern.
He maintained that the techniques involved — the exact nature of which remained classified — were "safe and lawful".
Guantánamo Diary gives us both – which has something to do with why it remained classified for so long, I'm sure".
Pentagon officials said later that while the report remained classified, the one-paragraph finding had been declassified but not released.
The technique of using dead children as aliases has remained classified intelligence for several decades, although it was fictionalised in Frederick Forsyth's novel The Day of the Jackal.
Similar(32)
But the general principle that the leaked files remain classified remains in effect, with varying consequences.
Those legal arguments remain classified.
Those measures remain classified.
Those exact methods remain classified.
The pigeons' missions remain classified.
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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