____any sign of their daughter"s school,the anxious couple turned to a policem for helpA.seeing not B.Not to have seen C.Not seeing D.Having not seen (请详细说明

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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

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.