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Our country______a lot in the last fifty years该怎么填?A.changed

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Our country______a lot in the last fifty years该怎么填?A.changed B.changes C.has changed
He______[have] to walk to school every day该怎么填?
Our country______a lot in the last fifty years该怎么填?A.changed
Our country__has changed____a lot in the last fifty years
He has to walk to school every day
再问: What
再答: 上面选C 下面填has
再问: 为啥 大神帮帮我
再答: 为啥问为啥呢? 英语语法规定是这样啊,约定俗成的. 第一个是现在完成时,第二个是第三人称变has