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
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B解析试题分析：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.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