So extraordianry __________ that it left a deep impression on visitors.
A.was the Shanghai 2010 Expo
B.the Shanghai 2010 Expo was
C.did the Shanghai 2010 Expo
D.the Shanghai 2010 Expo did
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A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2010世博会如此不寻常以至于给游客留下来很深的印象” 选A