Hearing a scream, I rushed downstairs, only the hostess lying unconscious on the floor.
A. seeing
B. having seen
C. seen
D. to see
网友回答
A. seeing
B. having seen
C. seen
(答案→)D. to see
解析：考查不定式做状语。不定式与only连用做状语，表示意料之外的结果；现在分词表示意料之中的结果。句意：听到尖叫声，我冲下楼，发现女主人躺地上，人事不省。这是一个意料之外的结果。故D正确。