_____ we have enough evidence, we can’t win the case.
A．OnceB．As long asC．UnlessD．Now that
C

試題分析：考查連詞辨析。根據(jù)句意：除非我們有充足的證據(jù)，否則我們贏不了這場官司。A一旦；B只要；C除非；D既然。所以答案選C。
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