题目内容

If it __________for the snow, we ___________the mountain yesterday.

A.were not; could have climbedB.were not; could climb
C.had not been; could have climbedD.had not been; could climb

C

解析试题分析:句意:假如天气昨天没有下雪,我们就已经爬上了那座山峰。if引导的从句对过去情况的虚拟推测,从句用had done,主句用would/should/could+have +done,故选C
考点:虚拟语气
点评:if的虚拟语气非常重要,简要概括如下:1、表示与现 在事实相反的情况,从句:If主语+过去时(Be动词用were);主句:主语+should/would/could/might+do: 2、表示与过去事实相反的情况,从句:If主语+had+done;主句:主语+should/would/could/might+have done 3、表示对将来情况的主观推测,从句:①if+主语+were to do②if+主语+should+do ③if+主语+did(动词过去式)/were ;主句:主语+should/would/could/might+do 

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