— 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. has explored

—That’s the third time he’s won the award in this field.

—Yes. He           his maximum potential in the past decade.

—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．has explored

---That’s the third time he’s won the award in this field.

---Yes. He ______ his maximum potential in the past decade.

1. A.
   explored
2. B.
   is exploring
3. C.
   has been exploring
4. D.
   has explored

--- That’s the third time he’s won the award in this field.
--- Yes. He ______ his maximum potential in the past decade.

1. A.
   explored
2. B.
   is exploring
3. C.
   has been exploring
4. D.
   has explored