题目内容

12．   we have enough evidence，we can't win the case．（　　）
A．OnceB．As long asC．UnlessD．Since

分析 除非我们有足够的证据，否则我们赢不了这个案件．

解答 答案C．once一旦；as long as只要；unless除非；since因为．once引导时间状语从句，since引导原因状语从句，as long as引导条件状语从句，但上下文语意不通顺，故排除B．unless=if…not，引导条件状语从句，根据句子所表达的含义，可知选C．

点评 本题考查从属连词的意义用法．在此句中从属连词引导条件状语从句．

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