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问题详情

The millions of circulations involved, _____ by hand, would have lost all practical value by the time they were finished.

A、had they been done

B、they had been done

C、having been done

D、they were done

时间：2021-09-01 16:18 关键词：安徽教育在线安徽理工大学电气工程及其自动化

答案解析

A

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