（） served as the ambassador and was twice sent out on diplomatic missions to the “new frontierland” known as Xiyu (Today’s Xinji

（） served as the ambassador and was twice sent out on diplomatic missions to the “new frontierland” known as Xiyu (Today’s Xinjiang).

A.Qi Jiguang

B.Ban Gu

C.Zhang Qian

D.Zheng Chenggong

正确答案：Zhang Qian