题干
—Long time no see. What have you been up to these days?
—I've been working on a research report, which was ________ easy. Which of the following can't be put in the blank?
A：anything but
B：little more than
C：far from
D：nowhere near
答案(点此获取答案解析）
B
上的函数
满足
，且
， 
，若有穷数列
（
）的前
项和等于
，则n等于