In the Britain,sales of cigarettes( have been reduced) quite a lot in the last ten years in Britai为什么用完成时?

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IntheBritain,salesofcigarettes(havebeenreduced)quitealotinthelasttenyearsinBritai为什么用完成时?IntheBritai

In the Britain,sales of cigarettes( have been reduced) quite a lot in the last ten years in Britai为什么用完成时?
In the Britain,sales of cigarettes( have been reduced) quite a lot in the last ten years in Britai
为什么用完成时?

In the Britain,sales of cigarettes( have been reduced) quite a lot in the last ten years in Britai为什么用完成时?
in the last ten years in Britain指的是一段时间,通常情况下,有last加时间的都用完成时,也是完成时态的一种标志.