Our country _______ a lot in the last fifty years.
A．will changeB．changedC．changesD．has changed
D

試題分析：句意是：我們國(guó)家在過去的五十年發(fā)生了許多變化。結(jié)合語境及時(shí)間狀語in the last fifty years可知描述的是一直持續(xù)到現(xiàn)在的動(dòng)作，故用現(xiàn)在完成時(shí)態(tài)，故選D。
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