问题补充：
Jiuzhaigou is the most beautiful place I have ever .
A. travelled
B. been in
C. been to
D. gone to
答案：
A. travelled
B. been in
(答案→)C. been to
D. gone to
解析：travelled旅行；在完成时态中has been to 是已经去过某处，并且已经回来了。has gone to 是已经去了某处，但是到目前为止还没有回来。 has been in 是已经在某处，句意：九寨沟曾经是我想去的最美丽的地方。结合语境可知选C。
