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

问题补充：

He looked as though he a ghost（鬼）.

A. saw

B. has seen

C. have seen

D. had seen

答案：

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。