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_____ we have enough evidence, we can’t win the case.
A.OnceB.As long asC.UnlessD.Now that
C

试题分析:考查连词辨析。根据句意:除非我们有充足的证据,否则我们赢不了这场官司。A一旦;B只要;C除非;D既然。所以答案选C。
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