In the past few years,现在完成时的标志,所以选B
类似的有,already（肯定）,yet（否定,疑问）,just,before,recently,still,lately,never,ever,never,twice,on several occasion,in the past few days/weeks/months/years,(up to)these few days/weeks/months/years,this morning/week/month/year,just,up to present,so far,up to now,till now,since+时间