---You look sad Kate.---Yeah I have made mistakes in my report.A. a littleB. a fewC. a

问题补充：

---You look sad, Kate.

---Yeah, I have made mistakes in my report.

A. a little

B. a few

C. a bit

D. a bit of

答案：

A. a little

B. a few

C. a bit

(答案→)D. a bit of

解析：little 修饰不可数名词，few修饰可数名词复数，这两个词都含有否定意义，表是少到几乎没有。a little修饰不可数名词, a few 修饰可数名词，均表少量，少数。a bit 只能接形容词副词原级或者比较级，意思是有点儿，如果修饰名词则后面需要加上介词of。结合上文可知句意为：我在报告中犯了点错误。故选D。