◎ 题干
—Sam, come downstairs, please. I need your help.
—Sorry,mum. I __       on the phone..
[     ]
A. am talking        
B. talked        
C. was talking    
D. have talked
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“—Sam, come downstairs, please. I need your help.—Sorry,mum. I __ on the phone..[ ]A. am talkingB. talked C. was talking D. have talked…”主要考查了你对  【现在进行时】  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。