The phrase "a single question that" is correct and usable in written English.
You can use it when referring to one specific question within a larger context or discussion.
Example: "I have a single question that I would like to ask before we proceed with the meeting."
Alternatives: "one question that" or "a solitary question that".
But Mr. Cameron insisted on a single question that would force Scottish voters into a clear choice, reflecting a belief that most Scots would oppose a complete break with the rest of Britain.
There is no sign of any soldier being asked a single question that would help to solve the crime – nothing about their failure to hear or to react to the screams at night or the furore in the morning, no demand to describe each other's movements or to explain what happened to the night patrols.
The patient incontinence severity assessment is a single question that asks the patient to rate the severity of her incontinence symptoms on a 5-point Likert scale (range: 1 [mild] to 5 [severe]).
Confidence was assessed using a single question that asked participants "if you decided to quit smoking, how confident are you that you could quit?" Participants marked their answers on a 1-10 scale from 1 "not confident" to 10 "very confident".
In this scale, respondents answer a single question that grossly classifies their level of function as low, medium, or high.
In the survey, prevalence of occupational burnout was based on a single question that has been validated against a full occupational burnout scale [ 22].
Moorehead asked McCarty the single question that created a for-profit path in McCarty's nonprofit career -- Can you lead the company in doing greater good for the world?
One mistake scientists commonly make is to "look to any sort of criticism as they would in a scientific context and try to answer every single question that comes their way, when sometimes those kinds of questions are just meant to distract or take time or create material that can be taken out of context later," Halpern says.
However, it may have been difficult to derive an accurate measurement of organic produce consumption using data from the single question that was asked on this topic.
Surrounded by reporters on the Senate's first full day back from Thanksgiving break, McCain shut down every single question that included the name "Donald Trump".
I am however concerned about the single question that has been used.
