◎ 题干
I think the MP3 is very  helpful. It ______for listening to music.  
[     ]
A. is used    
B. uses    
C. was used    
D. used
◎ 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 think the MP3 is veryhelpful. It ______for listening to music.[ ]A. is usedB. usesC. was usedD. used…”主要考查了你对  【被动语态】【一般现在时】  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。