用couldn't
couldn't have done sth.是对过去的否定猜测,表示过去不可能发生某事
根据前半句“昨天的展览会上我们没有见到他”,可知后半句意为“他昨天不可能去看展览”.
用情态动词“used to,had better,must,mustn't,will,may,couldn't,shou
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