– You seem to know much about the city.– That’s true. I it four times in the last three y

问题补充：

– You seem to know much about the city.

– That’s true. I it four times in the last three years.

A. visited

B. am visiting

C. have visited

D. will visit

答案：

A. visited

B. am visiting

(答案→)C. have visited

D. will visit

解析：根据句意可以得知我去过那个城市4次了，对现在的影响是很了解那座城市，

故要用完成时结构为have或has+过去分词，故选C。