—That'sthethirdtimehe'swontheawardinthisfield．—Yes.He

问题详情：

—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

知识点：现在完成时及其被动式

题型：选择题