题干
Listen, the boys ______ with each other over there. Please go and see what has happened.
A：are arguing
B：are argued
C：argue
答案(点此获取答案解析）
A
Listen, the boys ______ with each other over there. Please go and see what has happened.
A：are arguing
B：are argued
C：argue
在
上是单调函数,则实数的取值范围是