So sudden ______ that people in the building had no time to escape.A.the attack wasB.the a

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So sudden ______ that people in the building had no time to escape.

A.the attack was

B.the attack did

C.was the attack

D.did the attack

请帮忙给出正确答案和分析,谢谢!

热搜:关于氨基酸代谢错误的论述是_________。