our country _ten years of rapid development in science and technologyfreshmen will face _problems when they enter universities横线上填词组

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• our country _ten years of rapid development in science and technologyfreshmen will face _problems when they enter universities横线上填词组
• Like many cities in our country ,shenzhen has __ great changes in the past twenty years.Like many cities in our country ,shenzhen has __ great changes in the past twenty years.A.seen B.watched C.observed D.noticted请说明理由,
• Great changes______ in our country since 1980.填have been taken place还是填have taken place再说下理由.