◎ 题干
—What's wrong with your ipad2? The sound ____is not clear. 
—Yes. It has been broken for some time.
[     ]
A. come out        
B. coming out       
C. to come out      
D. came out
◎ 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's wrong with your ipad2? The sound ____is not clear.—Yes. It has been broken for some time. [ ]A. come outB. coming outC. to come out D. came out …”主要考查了你对  【现在分词】  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。