问题详情

答题翼 > 问答 > 外语类考试 > 正文
目录: 标题| 题干| 答案| 搜索| 相关

The millions of calculations involved, ______ by hand, would have lost all practical value


The millions of calculations 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

参考答案
您可能感兴趣的试题