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

試題分析：句意：假如天氣昨天沒有下雪，我們就已經(jīng)爬上了那座山峰。if引導(dǎo)的從句對過去情況的虛擬推測，從句用had done，主句用would/should/could+have +done,故選C
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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