I’m not sure of winning the match I will have a try anyway. A. WhileB. BeforeC. OnceD.

问题补充：

I’m not sure of winning the match, I will have a try anyway.

A. While

B. Before

C. Once

D. Since

答案：

(答案→)A. While

B. Before

C. Once

D. Since

解析：考查连词：A. While虽然B. Before在…前面C. Once一旦D. Since自从，句意：虽然我不确定能赢得比赛，但不管怎样我想试试。选A。