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If there hadn’t been so much smog in Beijing, we______________ the beautiful scenery across the Tiananmen Square.
A.enjoyed B.would have enjoyedC.had enjoyedD.would enjoy
B

试题分析:句意:如果在北京没有这么多烟雾,我们在穿过天安门广场时能够欣赏到很多漂亮的风景。if引导的从句如果表示与事实相反或是假设,要用虚拟语气。本题中对过去进行虚拟,主句用would have done.
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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