--Do you mind if I keep pets in this building?--A. I would rather you did not actually.B.

问题补充：

--Do you mind if I keep pets in this building?

--

A. I would rather you did not actually.

B. It is not allowed here

C. Yeah！I love pets.

D. No,you can not.

答案：

(答案→)A. I would rather you did not actually.

B. It is not allowed here

C. Yeah！I love pets.

D. No,you can not.

解析：情景交际。A.实际上我宁愿你不。 B.这里是不允许的 C.是啊！我喜欢宠物的 D.不，你不能。句意：你介意我在大楼里养宠物吗？结合语境可知选A为最佳答案。