______, explorers could never have found the cave.

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问题 ______, explorers could never have found the cave.

选项 A、But ior the fissure had been spotted
B、If not the fissure had been spotted
C、Had the fissure not been spotted
D、Had not the fissure been spotted

答案D

解析考查的知识点是虚拟语气。正式文体中，有时可把虚拟条件句中的连词if省去，而将were，had，should等助动词(不包括行为动词)提到主语前面。如果句中没有were，had或should时，既不能省略if，也不能倒装。因此正确答案是D选项。如：Were I to meet him tomorrow(=If I were to meet him tomorrow)，I should ask him about it．(要是我明天见到他，我就会问他这件事的。)句意为：要不是认出了山洞的裂缝，探险者们就不可能找到那个山洞。

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考博英语

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______, explorers could never have found the cave.

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Theonlysafewayofdistinguishingbetweenedibleandpoisonousmushroomsistolearnto______theindividualspecies.

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I’msurprisedtheyarenolongeronspeakingterms.It’snotlikeeitherofthemtobeara____.

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