Have you decided Shanghai? A. to visitB. visitC. visitingD. to visit to

问题补充：

Have you decided Shanghai?

A. to visit

B. visit

C. visiting

D. to visit to

答案：

(答案→)A. to visit

B. visit

C. visiting

D. to visit to

解析：句意：你已经决定参观上海了吗？Decide to do sth意为“决定做某事”；decide为及物动词，后面直接跟宾语；故选A。