问题: 1道选择
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
解答:
Inventors have changed the way we live
So they are famous for the great things they__D__
A.do
B.did
C.are doing
D.had done
参考文献：个人观点
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