题目内容
______ 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：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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