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【题目】If there be a global nuclear war, life on the earth as we know it____ end forever.

A . will; will B. should; would

C. were to; will D. is to; would

【答案】B

【解析】句意:如果发生核战争,那我们所熟悉的地球上的生命就会不复存在。在if引导的虚拟条件句中,分三种情况:与现在事实相反:(从句谓语动词)动词的过去式(be用were而不用was) (主句谓语动词) should/ would /could/ might+动词原形 与过去事实相反:(从句谓语动词) had + 过去分词 (主句谓语动词) should/ would/could/might + have+过去分词 与将来事实相反:(从句谓语动词)①.should+动词原形 ②.动词过去式 ③.were to+动词原形 (主句谓语动词) should/ would/ could/ might +动词原形。综上所述,选B。

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