◎ 题干
After the explosion the policemen did a lot of work to find out some clues from the        .    

A. on-lookers               
B. viewers    
C. people                    
D. witnesses


◎ 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“After the explosion the policemen did a lot of work to find out some clues from the.[ ]A. on-lookers B. viewersC. peopleD. witnesses…”主要考查了你对  【可数名词及其单复数】  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。