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What term should replace 'file' to ensure proper agreement in the phrase 'He opened the cases file'?

  1. case

  2. files

  3. case files

  4. files cases

The correct answer is: case files

The correct term to replace 'file' in the phrase 'He opened the cases file' is 'case files'. The phrase 'case files' refers to multiple files associated with various cases, and it properly agrees in number with the word 'cases'. In this usage, 'case' serves as an adjective that describes the type of files being referenced, indicating that these files pertain specifically to cases. Substituting 'case files' creates a clear and grammatically correct phrase that accurately conveys the intended meaning. Using just 'case' would imply a singular file, which does not match with 'cases'. Meanwhile, 'files' lacks specificity regarding the type of files, and 'files cases' is not a standard phrase and does not convey a clear meaning in this context. Therefore, 'case files' is the best choice to ensure grammatical accuracy and clarity.