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______ we have enough evidence (证据), we can't win the case.

A.Once B.As long as C.Unless D.Since

C

解析试题分析:考查连词。A一旦;B只要;C除非;D自从。句意:除非我们有足够的证据,否则我们不能赢得这个案件。故C正确。
考点:考查连词

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