Had electronic computers not been invented, ______ (很多关于太空飞行的问题不能解决了).

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问题 Had electronic computers not been invented, ______ (很多关于太空飞行的问题不能解决了).

选项

答案many problems of space flight could not have been solved

解析 (if从句中的had移到句首后，if省略了，从句中依旧用否定式的could not have been solved;被动语态构成为have been done)

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大学英语六级

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Had electronic computers not been invented, ______ (很多关于太空飞行的问题不能解决了).

大学英语六级

A、Thatpeopleweremoremoneyconscious.B、Thatpeopleweremorehealthconscious.C、Thatthepriceoffruitdroppeddramaticall

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Therearetwobasicwaystoseegrowth:Oneasaproduct,theotherasaprocess.Peoplehave(36)______viewedpersonalgrowth

Thenewgovernment_______(高度得重视解决失业的问题).

Electronicmailsystemsareeithercomputerizedornoncomputerized.Importantamongthecomputerizedsystemsarethe(36)______

Whatdiscoveryindicatesthatthebehaviorsofhumanbeingsdecoratingthemselvesstartedearlierthanwaspreviouslythought?

Whydowecry?Canyouimaginealifewithouttears?Notonlydotearskeepyoureyeslubricated,theyalsocontaina(36)______

Whydowecry?Canyouimaginealifewithouttears?Notonlydotearskeepyoureyeslubricated,theyalsocontaina(36)______

如图所示半径为R的半圆形截面，形心C与直径轴x1的距离yc=4R／(3π)，求得半圆截面对于形心轴Xc的惯性矩IXc为：

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