Answer :
The error with subject-verb agreement is this:
- The use of have instead of has.
What is the error with the subject-verb agreement?
The error with subject-verb agreement occurs when a plural verb is used with a plural subject. This should not be the case as the plural subject which is: The Millersburg Environmental Association should go with a singular verb: Has.
So the correct statement should be: "The Millersburg Environmental Association has worked..."
Learn more about subject-verb agreement here:
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