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____any sign of their daughter"s school,the anxious couple t

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____any sign of their daughter"s school,the anxious couple turned to a policem for help
A.seeing not B.Not to have seen C.Not seeing D.Having not seen (请详细说明
____any sign of their daughter
C 现在分词,与逻辑主语the anxious couple 关系是主动关系.现在分词否定是not doing 结构.所以这样选.
再问: 我们老师说是因为分词短语表目的 那B不也是分词短语么
再答: 这里是原因状语吧。