________ we have enough evidence, we can...

________ 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：考查连词。后句说官司打不赢，用unless来表示相反的条件。【名师点睛】条件状语从句就是在复合句中表示主句动作发生条件的状语从句。引导条件状语从句最经常用的连词是if，它的意思是“如果”；也可以用unless引导：unless的意思是“如果不”“除非”，相当于if not。

考点分析：

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