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Discover LudwigThe phrase 'which study' is correct and is used often in written English
It is used to refer to a specific study that has been previously mentioned in the text, or to a study that has been identified out of many, such as: "The study revealed that students with lower grades are more likely to be affected by exam anxiety. This finding is supported by numerous studies, which study was conducted by the American Psychological Association."
Exact(58)
You can probably guess which study we're referring to.
"We didn't have to think about which study rooms or desks would have computers hooked up to them".
Infrared and Raman microspectroscopy, which study the way molecules interact with light, are used for the purpose of authentication.
Writer visits several of this country's 7 Regional Primate Research Centers, which study various aspects of primatology.
This double agent had no idea which study participants had just relived a high school horror, and which had viewed theirs as a movie scene.
He also helped in the formation of the New York Mycological Association and the Connecticut-Westchester Mycological Astudyation, which study mushrooms and other fungi.
The evidence so far is not entirely straightforward and, depending which study we select, support can be found for both sides.
She graduated magna cum laude from Yale, in the course of which study she endured the John Hinckley episode without breaking down.
At this point, nobody knows which study to believe, but most experts agree that when people already have asthma, being around cats can make it worse.
Similar(2)
Which studies, exactly?
Which studies, Amy?
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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