I have to see the doctor because I            a lot these days.

A. coughed    
B. am coughing      
C. have been coughing
D. cough
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科目：高中英語 來源：重慶市期末題 題型：單選題

I have to see the doctor because I            a lot these days.
[     ]
A. coughed    
B. am coughing      
C. have been coughing
D. cough

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