题目内容

"They didn’t take measures in time, otherwise the explosions ____．"some experts said．
A．wouldn’t happenB．didn’t happen
C．wouldn’t have happenedD．mustn’t have happened
C
此题考查虚拟语气。由otherwise引导的含蓄条件句的虚拟语气，根据语境是与过去事实相反，其主句的构成为：would/could/might have done,所以选C,句意：一些专家说：“他们没有及时采取措施，不然的话爆炸就不会发生了。”
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