题目内容

15．If I _______ that program the day before yesterday，my computer wouldn't have broken down．（　　）
A．didn't runB．haven't runC．hadn't runD．were not to run

分析 如果前天我没有运行那个程序，我的电脑就不会崩溃．

解答 答案是C．本题考虚拟条件句．由题干中的the day before yesterday判断这是与过去事实相反的虚拟条件句；此时主句中用"would/should/could/might+have done"，虚拟条件句中往往用过去完成时，由此判断答案是C．

点评 在掌握虚拟语气的规则的基础上，判断题干属于什么类型的虚拟，然后根据语境，选用恰当的动词形式表达虚拟．

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