32．Many experimentsbefore the research team was able to get the exact data to carry on pro

发布时间：2020-08-16 06:33:17


32．Many experiments    before the research team was able to get the exact data to carry on project.
A. have done
B. had been doing
C. had been done
D. have been done

网友回答

A. have done
B. had been doing
(答案→)C. had been done
D. have been done
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