If the whole operation______beforehand, a great deal of time and money would have been lost.

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问题 If the whole operation______beforehand, a great deal of time and money would have been lost.

选项 A、was not planned
B、has not been planned
C、had not been planned
D、were not planned

答案C

解析 If the whole operation had not been planned beforehand为虚拟条件过去时。

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考博英语

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If the whole operation______beforehand, a great deal of time and money would have been lost.

考博英语

Effortstoreachtheinjuredmenhavebeen______becauseofasuddendeteriorationinweatherconditions.

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Ididn’tlistentoMomandIwasnotsurprisedatthelookof______onherface.

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Computersmayonedayturnnightintoday-withgoodold,naturalsunlight.Giantcomputer-controlledmirrors,thousandsoff

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设平面区域D由曲线y=，y=1围成，则(xy3－1)dσ等于()

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