摘要： In the last ten years, they three great scientific experiments. A. finished B. have finished C. had finished D. have been finished
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In the last ten years, they _______ three great scientific experiments.
A. finished B. have finished C. had finished D. have been finished
查看习题详情和答案>>In the last ten years, they _______ three great scientific experiments.
A. finished B. have finished C. had finished D. have been finished
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