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The explosion in the chemical plant ____...

The explosion in the chemical plant ______ avoided had the county authorities, aiming too much at short-term interests, performed their duties from the beginning.

A.should be B.might be C.must have been D.could have been

 

D 【解析】 考查虚拟语气。句意:如果县政府从一开始就履行自己的职责而不是过分着眼于短期利益,那么这座化工厂的爆炸本来是可以避免的。分析句子可知,本句是对过去事情的虚拟,if引导的条件句用过去完成时,if省略,句子倒装,所以主句是had the county authorities, aiming too much at short-term interests, performed their duties from the beginning,从句是could have been。故D选项正确。   条件从句的谓语动词形式 主句谓语动词形式 与过去事实相反的假设 had done would/could/might/should have done 与现在事实相反的假设 过去时(was→were) would/could/might/should do 与将来事实相反的假设 过去时(was→were);should do; were to do would/could/might/should do  
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