—Do you know the most ancient city in China—Xi’an well?—No this is the first time I here.

问题补充：

—Do you know the most ancient city in China—Xi’an well?

—No，this is the first time I here.

A. came

B. have come

C. am coming

D. come

答案：

A. came

(答案→)B. have come

C. am coming

D. come

解析：考查时态。It is the first/second…time sb. that某人第几次做某事，从句用现在完成时候，选B。