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

问题描述:

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...