Thanks to my teacher's valuable help, otherwise I my college entrance exam.
A. can't pass
B. hadn't passed
C. would not have passed
D. have not passed
网友回答
A. can't pass
B. hadn't passed
(答案→)C. would not have passed
D. have not passed
解析：C 考察虚拟语气。由语境可知，幸亏老师给我的巨大帮助，否则我不可能通过高考，前面从句相当于一个与过去事实相反的虚拟条件句，因此后面的主句谓语动词应该是would/could/might/should have done。故C正确。