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。
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