Before the first non-stop flight made in 1949, it______necessary for all planes to land for refueling.

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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 lave been

答案C

解析

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本试题收录于：英语题库成考专升本分类

英语

成考专升本

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Before the first non-stop flight made in 1949, it______necessary for all planes to land for refueling.

英语

成考专升本

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Mostchildrenwithhealthyappetitesarereadytoeatalmostanythingthatisofferedthemandachildrarelydislikesfood【36】i

"ShallIturnonthetelevision?"-"No,I’drathernot______televisiontonight."

Aroundtheworldmoreandmorepeoplearetakingpartindangeroussportsandactivities.Ofcourse,therehavealwaysbeenpeop

Alittleboyinvitedhismothertoattendhisschool’sfirstteacher-parentmeeting.Tothelittleboy’s【21】,shesaidshewould

Theroomisinaterribledirtysurroundings:it______cleaned.

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