invertors have changed the way we live.so they are famous for the great thin

invertors have changed the way we live.so they are famous for the great thin
invertors have changed the way we live.so they are famous for the great thin

invertors have changed the way we live.so they are famous for the great thin
原题是一道选择题,如下：
Inventors have changed the way we live.
So they are famous for the great things they___.
A.do B.did C.are doing D.had done
前一句用的是现在完成时,所以后面就一定用过去时态
答应应该选择B.did