问题
选择题
— 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
答案
答案：B
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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
答案：B