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—Sam,comedownstairs,please.Ineedyourhelp.—Sorry,mum.Ionthephone..[]A.amtalkingB.talkedC.wastalkingD.havetalked

题目详情
—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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答案和解析
A