So extraordianry that it left a deep impression on visitors.A. was the Shanghai Expo

问题补充：

So extraordianry that it left a deep impression on visitors.

A. was the Shanghai Expo

B. the Shanghai Expo was

C. did the Shanghai Expo

D. the Shanghai Expo did

答案：

(答案→)A. was the Shanghai Expo

B. the Shanghai Expo was

C. did the Shanghai Expo

D. the Shanghai Expo did

解析：考查So ... that句型so位于句首时句子采用倒装的用法。“上海世博会如此不寻常以至于给游客留下来很深的印象”选A