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?

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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?

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?
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?

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.

没有出现一个过去的时间点,而是相对于are即现在而言

我请教了一个在美国留学的同学 他说都可以啊