关于高中英语特殊句式的两道题

题目

关于高中英语特殊句式的两道题
1.So sudden ________that the enemy had no time to escape.
A.did the attack B.the attack did C.was the attack D.the attack was
2.So much of interest ______ that most visitors simply ran out of time before seeing it all.A.offered the World Expo B.the World Expo offered
C.did the World Expo offer D.the World Expo did offer
两个句子都是以so开头为什么第一题选C是完全倒装而第二题选C是半倒装?而且我们老师说过so开头都是完全倒装那第二题为什么不选择A?
第一句要是全倒装应该怎么写?
so放句首只能是半倒装吗?

答案