There have been many changes__in my hometown in the last ten years.

问题描述:

There have been many changes__in my hometown in the last ten years.
A..happen B.happened C.happening D.to happen
选哪个?为什么

B过去时,(过去的十年,我的家乡发生的很多的变化)答案是C!为什么sorry,因为been已经把过去时给带了。所以应该选择happens 或者happening,因为没有单数的happens,所以只能选择持续变化的happening。