问题描述：
would have lost是表推测还是虚拟语气
The millions of calculations involved,had they been done by hand,would have lost all the practical value by the time they were finished.
1.The millions of calculations (which is) involved,if they had been done by hand,would…?
2.by the time (when they) were finished?
3.以上我补充的对不?
4..
The millions of calculations involved,had they been done by hand,would have lost all the practical value by the time they were finished.
1.The millions of calculations (which is) involved,if they had been done by hand,would…?
2.by the time (when they) were finished?
3.以上我补充的对不?
4..
问题解答：
我来补答展开全文阅读