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：考查现在完成时：句意：--你爸爸在家吗？--不，他已经出去三个小时了。说明出去这个状态持续了三个小时，用现在完成时，而且be out意思是呆在外面，表示状态，可以和段时间状语连用。Go out是短暂动词，不能和一段时间连用。选B。
