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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WhatinformationdoesAnniegiveaboutskiingoneachofthefollowingmountaintrails?ChooseFOURanswersfromtheboxandwri

Lecturers(or/andsupervisors)本题有关印度学生对自己国家学习体系的评论。录音原文中的theneedsofthestudents对应题目中的providinginformationaboutfacilitiesa

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