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

【解析】

試題分析：考查時態(tài)。根據(jù)句中時間狀語Over the past decades在過去的幾十年中，說明一直持續(xù)到現(xiàn)在，并有可能繼續(xù)持續(xù)下去，故用現(xiàn)在完成進(jìn)行時。句意：在過去的幾十年中，因?yàn)槌錾�、遷移的上升和死亡率的下降，這個國家的人口一直在增加。故A正確。

考點(diǎn)：考查時態(tài)

 

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