If we had become aware of danger earlier, we _____ to stay in that temporary shelter.
A．wouldn’t chooseB．wouldn’t be choosing
C．wouldn’t have been choosingD．wouldn’t have chosen
D

試題分析：考查if的非真實條件句：句意：如果我早些意識到危險，我就不會選擇呆在臨時避難所了。從句用過去完成時表示和過去相反的情況，主句用would have done表示過去的虛擬。選D。
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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