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

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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

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
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

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
B.did
过去做的事