Question

How should the subject-verb agreement in this sentence be changed, if at all?

Of all the students at my school, Mary were the only one who have received a national award.
NO CHANGE
were the only one who has
is the only one who has
was the only one who will have
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Answer 1

The sentence should be changed to, Of all students at my school, Mary is the only one who has received a national award.

Answer 2

is the only one who has