Inventors have changed the way we live.So they are famous for the great things they___.

问题描述:

Inventors have changed the way we live.So they are famous for the great things they___.
为什么填did而不是had done呢?

因为前面句子所描述的都是现在的情况,而他们做事情是相对于现在而言的,故应使用一般过去时,所以填did.
如果谈论的是过去某个时间以前发生的动作或事情,就要用过去完成时(had done)了.