题干
---Excuse me, is this seat taken?
---______. That man got his books and left a few minutes ago.
---______. That man got his books and left a few minutes ago.
A：I’m afraid so
B：I don’t think so
C：I don’t know
D：I hope not
答案(点此获取答案解析）
B
、
满足条件
时，变量
的取值范围是( )