问题补充：
--- Is your father in?
--- No, he for three hours.
A. was out
B. has been out
C. went out
D. has gone out
答案：
A. was out
(答案→)B. has been out
C. went out
D. has gone out
解析：句意：你的父亲在家吗？不，他已经出去三个小时了。for three hours表示一段时间的时间状语，句子用现在完成时，be out 表示状态，动作可以延续，故选B
