Question

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

Answer 1

A

試題分析：考查時(shí)態(tài)。根據(jù)句中時(shí)間狀語(yǔ)Over the past decades在過(guò)去的幾十年中，說(shuō)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(shí)。句意：在過(guò)去的幾十年中，因?yàn)槌錾�率、遷移的上升和死亡率的下降，這個(gè)國(guó)家的人口一直在增加。故A正確。