There ------- a lot of changes in Beijing since the 2008 Oly

问题描述:

There _______ a lot of changes in Beijing since the 2008 Olympic.横线上填have been 还是are
请说明原因,谢谢
1个回答 分类:英语 2014-11-22

问题解答:

我来补答
have been
since(自从)用于完成时态中,主句好为完成时态.
 
 
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