The first use of the principle of the airfoil was ______but in water.

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问题 The first use of the principle of the airfoil was ______but in water.

选项 A、in air
B、neither air
C、either in air
D、not in air

答案D

解析 The paired expression not... but connects two prepositional phrases: not in air but in water.

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托福（TOEFL）

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The first use of the principle of the airfoil was ______but in water.

托福（TOEFL）

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TemperatureThreescalesoftemperature,eachofwhichpermitsaprecisemeasurement,areinconcurrentuse:theFahrenheit,

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A．与鼻咽癌有关B．与宫颈癌有关C．与大肠癌有关D．与皮肤癌有关日本血吸虫病

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