It is no doubt that once this city you’ll find that there is so much surprise waiting fo

问题补充：

It is no doubt that once this city, you’ll find that there is so much surprise waiting for you to discover.

A. visit

B. visiting

C. visited

D. to visit

答案：

A. visit

(答案→)B. visiting

C. visited

D. to visit

解析：本句话为省略，once后省略了you are，所以选择visiting。