They didn’t take measures in time, otherwise the explosions ．some experts said．
A. wouldn’t happen
B. didn’t happen
C. wouldn’t have happened
D. mustn’t have happened
网友回答
A. wouldn’t happen
B. didn’t happen
(答案→)C. wouldn’t have happened
D. mustn’t have happened
解析：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。”