Over the past decades, the population in this country      because of the risin

Over the past decades, the population in this country      because of the risin

题型:不详难度:来源:
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
A
解析

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。
举一反三
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—Sorry, Mom.
A.have always thrownB.always throw
C.are always throwing D.always threw

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They could have attended the awarding ceremony,but their flight      due to the bad weather.
A.was delayed B.had been delayed
C.has delayedD.was delaying

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Mother wanted to be a good provider, a role she ________ since her marriage to
Father.
A.shouldersB.shouldered
C.is shoulderingD.has been shouldering

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I"m tired out.I ________ all afternoon and I don"t seem to have finished anything.
A.shoppedB.have shopped
C.had shoppedD.have been shopping

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—Have you finished reading Jane Eyre?
—No,I ________my homework all day yesterday.
A.was doingB.would do
C.had doneD.do

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