题干
I have to see the doctor because I ________ a lot lately.
A：have been coughing
B：had coughed
C：coughed
D：cough
答案(点此获取答案解析）
A
I have to see the doctor because I ________ a lot lately.
A：have been coughing
B：had coughed
C：coughed
D：cough
