问题
选择题
Last year the number of studects 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
an average of平均 a numberof 很多 an amount of 数量（修饰不可数名词）
a quantity of很多，句意“去年考取驾照的学生数达到200000平均每年40000”，答案A。