(2013·高考重庆卷)________we have enough evide...

(2013·高考重庆卷)________we have enough evidence，we can’t win the case.

A．Once B．As long as

C．Unless D．Since

C 【解析】选C。题干的意思是：“如果我们没有足够的证据，我们就不能打赢这场官司。”分析题意可知，前后两句之间为条件关系。A项意为“一旦”；B项意为“只要……就……”；C项意为“除非，如果……不……”；D项意为“自从”。unless＝if...not，所以答案为C。

考点分析：

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