题干
_________ useful advice she gave you ! You should listen to her.
A：How
B：How a
C：What
D：What a
答案(点此获取答案解析）
C
_________ useful advice she gave you ! You should listen to her.
A：How
B：How a
C：What
D：What a
实数范围内有意义，则x的取值范围是（ ）
