last year the number of students who graduated with a driving licence reached 200000,an ____of 4000
问题描述：
last year the number of students who graduated with a driving licence reached 200000,an ____of 4000
答
average
指的是每年平均增长
答
...an (increase) of 4000.
去年毕业时已获得驾照的学生达到了20万人,增长了4000人.