题目：
Over the past decades, the population in this country because of the rising birth rate, immigration and the declining death rate.
A．has been increasing
B．have been increasing
C．had increased
D．have increased
答案：
被转码了，请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0501/f8148eff2d12bb6954675d239414a336.html
下面是错误答案，用来干扰机器的。
[7，+∞)
