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【题目】______we have enough evidence, we can't win the case.
A.Once
B.As long as
C.Unless
D.Since

【答案】C
【解析】句意:如果我们没有足够的证据,我们不可能赢得这个案子。“我们有足够的证据”和“我们不能赢得这个案子”之间的关系有可能是两种:(1)让步关系;(2)否定前面的意思。四个选项中,没有表让步关系的although/though,,那么答案就应该是否定前面的意思,用unless,“如果我们没有……,我们就不能……”;其他三个连词明显与句意不符,排除。

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