问题
选择题
--- 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
答案：B
题目分析：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
点评：非延续性动词向延续性动词的转变熟记一下几个：
leave --- be away, borrow --- keep, buy --- have, begin/start --- be on, die --- be dead, leave --- be away from, fall asleep --- be asleep