问题补充:
Last year the number of students who graduated with a driving licence reached 200,000,a(n) of 40,000 per year.
A. average
B. number
C. amount
D. quantity
答案:
(答案→)A. average
B. number
C. amount
D. quantity
解析:句意:去年考过驾照的学生人数达到了20万,平均每年4万。an average of平均是……。