______, everyone would probably have escaped from the building.

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问题 ______, everyone would probably have escaped from the building.

选项 A、Had it not been locked the fire door
B、Had not been locked the fire door
C、Had the fire door not been locked
D、Had the fire door not locked

答案C

解析 如果不是防火门被锁,可能所有人都已逃离了该建筑。Had the fire door not been locked=If the fire door had not been locked。
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