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：A. While当…时候，虽然，然而，B. Before在…前面，C. Once曾经，一旦，D. Since自从，因为，句意：虽然我对赢得比赛没有把握，但是不管怎样我会试一下的。所以选A。
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