He looked as though he _________ a ghost（鬼）.
A．sawB．has seenC．have seenD．had seen
D
考查虛擬語氣。句意：他看起來好像是看見了鬼。結(jié)合語境可知下文是對過去的虛擬，并沒有真的看見鬼，故用過去完成時態(tài)，選D。
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