题干
My _________ sister explained _________ me why she used my bike.
A：older, for
B：older, in
C：elder; to
D：elder; for
答案(点此获取答案解析）
C
My _________ sister explained _________ me why she used my bike.
A：older, for
B：older, in
C：elder; to
D：elder; for
：
，若不等式
对任意实数
都成立，则实数
的取值范围是
