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_____ we have enough evidence, we can’t win the case.

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

C

解析试题分析:A. Once一旦,B. As long as 只要,C. Unless除非,D. Since 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子。选C。
考点:考查连词

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