In face of failure it is the most important to keep up good state of mind.A. 不填; aB. a

问题补充：

In face of failure, it is the most important to keep up good state of mind.

A. 不填; a

B. a; 不填

C. the; 不填

D. 不填; the

答案：

(答案→)A. 不填; a

B. a; 不填

C. the; 不填

D. 不填; the

解析：可联系答.案.网客服索取。