He looked as though he a ghost（鬼）.A. sawB. has seenC. have seenD. had seen

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A. saw
B. has seen
C. have seen
(答案→)D. had seen
解析：考查虚拟语气。句意：他看起来好像是看见了鬼。结合语境可知下文是对过去的虚拟，并没有真的看见鬼，故用过去完成时态，选D。