it seems that he since he started smoking last year.(cough)

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it seems that he since he started smoking last year.(cough)

it seems that he since he started smoking last year.(cough)
it seems that he since he started smoking last year.(cough)

it seems that he since he started smoking last year.(cough)
has coughed
since指自从,加从句的用法如下:
1) since +从句 
Great changes have taken place since you left.
Considerable time has elapsed since we have been here.
2) It is +一段时间+ since从句
It is two years since I became a postgraduate student.

it seems that he has been coughing since he started smoking last year.

写题目要规范。