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    精英家教网 > 高中英语 > 题目详情
    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
    A

    试题分析：考查时态。根据句中时间状语Over the past decades在过去的几十年中，说明一直持续到现在，并有可能继续持续下去，故用现在完成进行时。句意：在过去的几十年中，因为出生率、迁移的上升和死亡率的下降，这个国家的人口一直在增加。故A正确。
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