◎ 题干
I happened __________the article when he asked me about it.      
[     ]
A. having read                  
B. to have read      
C. to be read                    
D. reading
◎ 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“I happened __________the article when he asked me about it.[ ]A. having read B. to have readC. to be read D. reading…”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。