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The phrase 'it has been speculated' is correct and usable in written English.
It is usually used to introduce an opinion, idea, or theory that others have proposed but that has not been proved or confirmed. For example: "It has been speculated that the cause of the accident was due to pilot error."
Exact(60)
It has been speculated that its history may go back to Pharaonic Egypt.
It has been speculated that scar formation leads to tape shortening and stiffening.
It has been speculated that prion strains depend on different sets of so far unknown cofactors27.
It has been speculated over the years he may very well be Jack Kerouac.
It has been speculated that their focus on the issue has been undermining their campaign.
It has been speculated that Valles Marineris may be a fault system separating two continental plates.
It has been speculated that they may be regions of highly reflective salts.
Furthermore, it has been speculated that if fats are reduced from the diet, it may become high in sucrose.
It has been speculated that this pulmonary inflammatory syndrome is secondary to the extrapleural dissemination of the talc particles.
It has been speculated that this change in feeding behaviour is associated with increased fat deposition and feed conversion ratio.
It has been speculated that micromotions at the stem neck interface were responsible for these implant failures.
More suggestions(15)
it has been remembered
it has been suspected
it has been deemed
it has been implied
it has been presupposed
it has been presumed
it has been anticipated
it has been forecast
it has been forecasted
it has been felt
it has been rated
it has been assumed
it has been supposed
it has been surmised
it has been believed
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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