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

試題分析：句意：如果在北京沒有這么多煙霧，我們在穿過天安門廣場時能夠欣賞到很多漂亮的風景。if引導的從句如果表示與事實相反或是假設，要用虛擬語氣。本題中對過去進行虛擬，主句用would have done.
點評：if的虛擬語氣非常重要，簡要概括如下：1、表示與現(xiàn) 在事實相反的情況，從句：If主語+過去時(Be動詞用were)；主句：主語+should/would/could/might+do：　2、表示與過去事實相反的情況，從句：If主語+had+done；主句：主語+should/would/could/might+have done　3、表示對將來情況的主觀推測，從句：①if+主語+were to do②if+主語+should+do ③if+主語+did（動詞過去式）/were ；主句：主語+should/would/could/might+do　
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