where have you ____?I didn`t find you in your office

题目

where have you ____?I didn`t find you in your office
I______to the library.
A.gone;have gone B.been;have gone
C.been;went D.been to;have been
速度．．．．

答案

C.been;went,
have been to;去了某地又回来了；
went to：刚才去了图书馆；
have gone to:去了某地没回来