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______ we have enough evidence, we can’t win the case.

A．Once B．As long as C．Unless D．Since

C

解析試題分析：考查連詞：A. Once一旦，B. As long as 只要，C. Unless除非，D. Since 自從，句意：除非我們有足夠的證據(jù)，否則我們不能贏得這個案子。選C。
考點(diǎn)：考查連詞

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