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

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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