题干
— I went to bed at about eleven forty last night.
— _____ it was too late.
A：I wish
B：I hope
C：I'm afraid
D：I'm sure
答案(点此获取答案解析）
C
— I went to bed at about eleven forty last night.
— _____ it was too late.
A：I wish
B：I hope
C：I'm afraid
D：I'm sure
对一切实数
均成立，则
的取值范围是