问题描述:
I have to see the doctor because I ____ a lot lately.
A. have been coughing
B. had coughed
C. coughed
D. cough
解释越详细越好!
请解释D为什么错误
A. have been coughing
B. had coughed
C. coughed
D. cough
解释越详细越好!
请解释D为什么错误
问题解答:
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