—That'sthethirdtimehe'swontheawardinthisfield．—Yes.He

問題詳情：

—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

【回答】

C

知識點：現在完成時及其被動式

題型：選擇題