Over the past few years ,this company____a lot with the joint efforts of all the employers and
问题描述：
Over the past few years ,this company____a lot with the joint efforts of all the employers and
employees
A:changed B:had changed C;has changed D:changes
答
Over the past few years表明要用现在完成时,所以用C类似的还有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/we...