China's export increased at an average rate of nearly 20% 【per annum】 in 1980s.
A、period
B、every country
C、autumn
D、every year
【正确答案】:D
China's export increased at an average rate of nearly 20% 【per a
📱 扫码体验刷题小程序
扫一扫使用我们的微信小程序