问题补充：
-------Where you ?
------I the teacher’s office.
A. have been; have been to
B. have been to; have gone to
C. have been; have gone to
D. have been to; have been to
答案：
(答案→)A. have been; have been to
B. have been to; have gone to
C. have been; have gone to
D. have been to; have been to
解析：句意：你去哪儿了？——我去老师的办公室了。结合语境可知本题描述的是现在已经完成的动作，go表示瞬间动作，be表示持续性状态，结合语境可知本句强调的是过去的状态，上文where是副词，不需要介词，故选A。
