The town a lot since i was there in 1980a:has changed b:was changing c:had changed d:has been changed

问题描述:

The town a lot since i was there in 1980
a:has changed b:was changing c:had changed d:has been changed

D since 主句应该用完成式 城镇被改变了 所以用被动

A 典型的现在完成时自从1980年我在那里这个城镇发生了很多变化,强调过去发生的动作对现在造成的影响