【題目】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：如果發(fā)生核戰(zhàn)爭，那我們所熟悉的地球上的生命就會(huì)不復(fù)存在。在if引導(dǎo)的虛擬條件句中，分三種情況：⑴與現(xiàn)在事實(shí)相反：（從句謂語動(dòng)詞）動(dòng)詞的過去式(be用were而不用was) （主句謂語動(dòng)詞） should/ would /could/ might+動(dòng)詞原形 ；⑵與過去事實(shí)相反：（從句謂語動(dòng)詞） had + 過去分詞 （主句謂語動(dòng)詞） should/ would/could/might + have+過去分詞 ；⑶與將來事實(shí)相反：（從句謂語動(dòng)詞）①.should+動(dòng)詞原形 ②.動(dòng)詞過去式 ③.were to+動(dòng)詞原形 （主句謂語動(dòng)詞） should/ would/ could/ might +動(dòng)詞原形。綜上所述，選B。

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