—That's the third time he's won the award in this field.
—Yes. He ______ his maximum potential in the past decade.
A. explored B. is exploring
C. has been exploring D. had explored
—That's the third time he's won the award in this field.
—Yes. He ______ his maximum potential in the past decade.
A. explored B. is exploring
C. has been exploring D. had explored
C