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

試題分析：考查連詞。A一旦；B只要；C除非；D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件。故C正確。
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