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

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问题 The millions of calculations involved, ______by hand, would have lost all practical value by the time they were finished.

选项 A、had they been done
B、they had been done
C、having been done
D、they were done

答案A

解析该题是语法结构题，考查虚拟语气的用法。在该句中，虚拟语气用来表示与过去事实相反的情况，主句用would have done形式，从句用had done形式。引导非真实条件句中的引导词if被省略了，助动词had提前，所以出现了had they been done这样的倒装结构。因此，根据题意和语法规则，选项A为最佳答案。

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专业英语四级

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

专业英语四级

Tendollarsnotbuyasmuchasusedto.

Inrecentdecadeschildspecialistshavetriedmoreandmoretohelpparentswiththeirchildren’sschoolbehavior,Schoolsofe

Accordingtothestudy,howmanypeoplereallyintendtoloseweight?

TeamWorkTheclassteacher/sandstudent/sneedtoworklikeateam,withtheteacherbeingthecoachwhoneedstocontinu

______yourage,inexperienceandlackofprestigiousbackground,you’vedoneprettywell..

David,whowasspoilt,havingbeenbornwitha______spooninhismouth,wasaverydifficultstudent.

Peopletakephotographsfora【C1】ofreasonsbutthemost【C2】istomakearecordofsomethinginordertoshowot

TheEnglishlanguageexistsinaconditionofeverlastingdanger,itsAmericanbranchmostparticularly,assaultedasitisfrom

Thegovernmentistobanpaymentstowitnessesbynewspapersseekingtobuyuppeopleinvolvedinprominenteases【C1】______the

Areyouawarethatyouactuallypossesssixsenses?Thesixthisamuscularsenseresponsiblefordirectingyourmusclesintelli

引起局麻药中毒的原因是()。

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毛泽东在《＜共产党人＞发刊词》中所说的“伟大的工程”是指：

2019年6月，全国发行地方政府债券8996亿元，同比增长68.37%，环比增长195.63%。其中，发行一般债券3178亿元，同比减少28.33%，环比增长117.08%，发行专项债券5818亿元，同比增长540.04%，环比

[*][解法一][解法二]

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Nosooner______thanherealizedthatheshouldhaveremainedsilent.

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

专业英语四级

Tendollars______notbuyasmuchas______usedto.

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Accordingtothestudy,howmanypeoplereallyintendtoloseweight?

TeamWorkTheclassteacher/sandstudent/sneedtoworklikeateam,withtheteacherbeingthecoachwhoneedstocontinu

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David,whowasspoilt,havingbeenbornwitha______spooninhismouth,wasaverydifficultstudent.

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引起局麻药中毒的原因是()。

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根据我国《刑事诉讼法》的规定，人民检察院对于公安机关移送起诉的案件．应当在一个月以内作出决定，重大、复杂的案件可以延长的时间是()。

毛泽东在《＜共产党人＞发刊词》中所说的“伟大的工程”是指：

2019年6月，全国发行地方政府债券8996亿元，同比增长68.37%，环比增长195.63%。其中，发行一般债券3178亿元，同比减少28.33%，环比增长117.08%，发行专项债券5818亿元，同比增长540.04%，环比

[*][解法一][解法二]

Likemanyofmygeneration,Ihaveaweaknessforheroworship.Atsomepoint,however,wealltoquestionourheroesandourne

Nosooner______thanherealizedthatheshouldhaveremainedsilent.

Tendollarsnotbuyasmuchasusedto.

Peopletakephotographsfora【C1】ofreasonsbutthemost【C2】istomakearecordofsomethinginordertoshowot