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Discover LudwigSuggestions(5)
'questionnaire was completed' is correct and can be used in written English.
You could use it to describe the completion of a task, for example: The participants were asked to complete a questionnaire before the study began. All questionnaires were completed by the end of the day.
Exact(60)
The questionnaire was completed by 215 teachers.
A questionnaire was completed during each interview.
The questionnaire was completed 106 times.
Following ultrasound a second questionnaire was completed.
The questionnaire was completed by 9,635 respondents.
Results: The questionnaire was completed by 50 relatives.
The questionnaire was completed by 113 women (83.7%).
Following microstimulator insertion, a patient experience questionnaire was completed quarterly.
A self-administered questionnaire was completed by 1155 students.
A 49-item questionnaire was completed by 163 DM1 patients.
Results: The questionnaire was completed by 3133 women (83%).
More suggestions(15)
questionnaire was corrected
interview was completed
states was completed
questionnaires was completed
questions was completed
questionnaire was established
questionnaire was undertaken
questionnaire was delivered
questionnaire was elaborated
questionnaire was applied
questionnaire was created
questionnaire was composed
survey was completed
questionnaire was included
questionnaire was comprehensive
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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