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.
Inventors have changed the way we live.So they are famous for the great things they___.
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?
为什么填did而不是had done呢?
英语人气：731 ℃时间：2020-04-17 18:52:05
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