Question
The diligent student, (A)/ as well as her classmates,
have (B)/ contributed valuable insights to (C)/ the collaborative research project. (D)/ No error (E)Solution
When two subjects are connected by ‘as well as’, the verb is applied according to the first subject. The correct sentence would be: "The diligent student, as well as her classmates, has contributed valuable insights to the collaborative research project."
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