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. I have to see the doctor because I_________a lot lately.                        

   A. have been coughing                   B. had coughed

   C. coughed                            D. cough

I have to see the doctor because I         a lot lately.

A.have been coughing    B.had coughed  C. coughed       D. cough

. I have to see the doctor because I_________a lot lately.                        

   A. have been coughing                   B. had coughed

   C. coughed                            D. cough

 I have to see the doctor because I        a lot lately.                           

   A. have been coughing                   B. had coughed

   C. coughed                            D. cough

I have to see the doctor because I _________ a lot lately．

A．have been coughing                      B．had coughed

C．coughed                               D．cough

 I have to see the doctor because I________a lot lately．

      A．cough                                           B．coughed         

       C．have been coughing                            D．had coughed