问题补充:
Our country a lot in the last fifty years.
A. will change
B. changed
C. changes
D. has changed
答案:
A. will change
B. changed
C. changes
(答案→)D. has changed
解析: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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