— How long have you been in this office?— Just a few minutesMy cousins here together wit

问题补充：

— How long have you been in this office?

— Just a few minutes．My cousins here together with me．

A. have walked

B. had walked

C. walked

D. have been walking

答案：

A. have walked

B. had walked

C. walked

D. have been walking

解析：考查时态：句意：--你在办公室多久了？--只有一会，我和堂兄在散步的，因为现在已经在办公室了，所以散步是过去的事情。选C。