问题
选择题
If I _______ that program the day before yesterday, my computer wouldn’t have broken down.
A．didn’t run
B．haven’t run
C．hadn’t run
D．were not to run
答案
答案：C
题目分析：考查虚拟语气。句意：如果我前天不运行这个程序，电脑就不会瘫痪了。根据the day before yesterday和后面的wouldn’t have broken, 可知假设条件与过去相反, 所以用过去完成时态。选C。