—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