题目内容

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

试题分析：句意是：我们国家在过去的五十年发生了许多变化。结合语境及时间状语in the last fifty years可知描述的是一直持续到现在的动作，故用现在完成时态，故选D。
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