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The phrase "a prototype has been" is correct and usable in written English.
It can be used when discussing the status or development of a prototype in a project or research context.
Example: "A prototype has been developed to test the new features of the software before the final release."
Alternatives: "a prototype was created" or "a prototype has been designed".
Exact(60)
A prototype has been realized and validated.
A prototype has been implemented using the AGG software tool.
Then, a prototype has been built and tested in laboratory.
Such a prototype has been designed and tested in 65nm CMOS technology.
A prototype has been successfully tested using a commercial gas engine.
A prototype has been in action on the island of Islay, off the Scottish coast, since 2000.
A prototype has been made, but the device is still a long way off reaching the shelves.
A prototype has been fabricated to verify the working principles, designs and simulations.
A prototype has been developed on state-of-the-art Smart Glass devices.
A prototype has been tested using a positron test beam at DESY.
A thorough study of this concept has been conducted and a prototype has been designed.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com