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

问题描述:

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

has coughedsince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 ye...