（）two years（）she became a college student.A.It was ;when B.It i_其他解答

（）two years（）she became a college student.
A.It was ;when B.It is;when C.It was;since D.It is ;since
求答案和选择原因

人气：489 ℃　时间：2019-10-10 06:35:19

解答

D.It is ;since
在主句表示多长时间时,可以用一般现在时代替现在完成,此处就是用it is 代it has been,since本来是现在完成时的时间标志语.