首页
登录
职称英语
Before the first non-stop flight made in 1949, it ______necessary for all planes
Before the first non-stop flight made in 1949, it ______necessary for all planes
游客
2023-11-13
13
管理
问题
Before the first non-stop flight made in 1949, it ______necessary for all planes to land for refueling.
选项
A、would be
B、has been
C、had been
D、would have been
答案
C
解析
由before引导的时间状语从句是一般过去时,所以主句应该采用过去完成时。
转载请注明原文地址:https://tihaiku.com/zcyy/3184678.html
相关试题推荐
______theheavyfoghasdelayedtheflight,sotheywouldn’tarriveontime.A、Im
Thefollowingdetailsaretrueabouttheman’sflightEXCEPT[br][originaltext
Thefollowingdetailsaretrueabouttheman’sflightEXCEPT[originaltext]M:He
Inthesentence"Theboyscoutsteachtheirmembersan’outdoorcode’beforeth
—Whyareyoustaringatit?—I’veneverseen______flowerbefore.A、kindofB、that
Alltheinvestigations______beforethedeadline,thestaffdecidedtohaveapar
Letme______youthatIwillusewhateverforceisnecessarytorestoreorder.A
Thehousewiveswouldusually______thefruitbeforemakingtheirmindsupwhich
Howmanypeoplewerekilledaccordingtooppositionsourcesbefore?[br][origi
Howmanypeoplewerekilledaccordingtooppositionsourcesbefore?[br][origi
随机试题
11.______istheonlypredominatelyFrench-speakingterritoryinNorthAmerica.A、
ThreeConceptsinArtHistoryI.Commonalities-Certainchunkof【T1】_____,【T1】_
"Iwanttocriticizethesocialsystem,andtoshowitatwork,atitsmost
变压器励磁涌流中含有明显的高次谐波,其中()分量比例大。A.二次谐波
回答隧道通风设备质量检验评定的提问。(2)隧道通风设备质量检验评定的关键实测项目
藤黄用豆腐煮制的主要目的是A.利于贮藏B.降低毒性C.增强疗效D.矫臭矫味E.缓
下列关于表面活性剂表述正确的是A.非离子表面活性剂毒性和离子表面活性剂相同 B
根据我国公司法,关于股份有限公司监事会的说法,错误的是()。A.监事会成员不得少
根据消费税法律制度的规定,下列各项中,应作为委托加工应税消费品缴纳消费税的是()
在企业战略研究中,通过SWOT分析可选择的战略主要有() A.—体化战
最新回复
(
0
)