题目内容
Our country _______ a lot in the last fifty years.
| A．will change | B．changed | C．changes | D．has changed |
D
解析试题分析：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。
考点：考查现在完成时态。
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