题干
----Has the teacher who was hurt in the earthquake been taken good care of?
----Ever since she was sent to the hospital, she has never been _______.
----Ever since she was sent to the hospital, she has never been _______.
A：put out
B：left alone
C：looked after
D：fallen into
答案(点此获取答案解析）
B
在
上是单调函数,则实数
的取值范围是