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

解析这是一句虚拟语气的句子，条件句使用了省略if的倒装句形式，动作与过去事实相反。

转载请注明原文地址:https://kaotiyun.com/show/MfmK777K

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

Thesuperstardescended______asmallcoastaltown,whichwassplashed______thefrontpageofthelocalnewspaper.

Jealousytypicallyreferstothethoughts,feelings,andbehaviorsthatoccurwhenapersonbelievesavaluedrelationshipisbe

Iwouldjustassoonyou______thebookyesterday.

Theystoodgazingatthehappy______ofchildrenplayinginthepark.

Trillionsofincrediblytinydiamonds,possiblyformedbyadyingstarbeforethesolarsystemwasborn4.5billionyearsago,h

WhenItrytounderstand______thatpreventssomanyAmericansfrombeinghappyasonemightexpect,itseemstomethatthere

Mypain______apparentthemomentIwalkedintotheroom,forthefirstmanImetaskedsympathetically:"Areyoufeelingallf

TheWorldHealthOrganizationreportedtheenvironmentalhealthrisks,NOTincluding

Americanstodaychooseamongmoreoptionsinmorepartsoflifethanhaseverbeenpossiblebefore.Toanextent,theopportunit

Everysecond,1hectareoftheworld’srainforestisdestroyed.That’sequivalenttotwofootballfields.AnareathesizeofNe

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Thesuperstardescendedasmallcoastaltown,whichwassplashedthefrontpageofthelocalnewspaper.