would have lost是表推测还是虚拟语气

题目

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..

答案

虚拟语气前面有had they been done by hand就是如果是通过手工完成的had提前得倒装形式,虚拟语气.1.The millions of calculations (which is) involved,if they had been done by hand,would…?不对正确说法是 Milli...