题干
—Look, what an old palace! It looks so great!
—Yeah, it _______ nearly 800 years ago.
A：was building
B：was built
C：has built
D：is built
答案(点此获取答案解析）
B
—Look, what an old palace! It looks so great!
—Yeah, it _______ nearly 800 years ago.
A：was building
B：was built
C：has built
D：is built
是R上的偶函数，且在
上是增函数，若
,则实数
的取值范围是