◎ 题干
-What did you hear last night?
-I seemed_________ someone knock at the door.    
[     ]

A. to be heard                    
B. to be hearing    
C. to have heard               
D. having heard

◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“-What did you hear last night?-I seemed_________ someone knock at the door. [ ]A. to be heardB. to be hearing C. to have heardD. having heard…”主要考查了你对  【不定式的完成式】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。