If it had not been for your help I the examination.A. could not passB. would not pass C.

问题补充：

If it had not been for your help, I the examination.

A. could not pass

B. would not pass

C. would not have passed

D. can not have passed

答案：

A. could not pass

B. would not pass

(答案→)C. would not have passed

D. can not have passed

解析：考察虚拟语气，跟条件从句要不是你的帮助，从句为过去完成时态，可知主句事情已经发生，可知选C，我不会通过这次考试。