If you don't know that is the mother of success your are sure to be in life.A. failure;

问题补充：

If you don know that is the mother of success, your are sure to be in life.

A. failure; failure

B. a failure;a failure

C. a failure; failure

D. failure; a failure

答案：

A. failure; failure

B. a failure;a failure

C. a failure; failure

(答案→)D. failure; a failure

解析：本题考查failure的用法。failure作“失败”讲是不可数名词，作“失败的人(或事)”讲是可数名词。