2. 外语
  3. A in the development of air transportation B the earliest passenger flights were successfully operated C to make travel easy and

A in the development of air transportation B the earliest passenger flights were successfully operated C to make travel easy and

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问题 A in the development of air transportation
B the earliest passenger flights were successfully operated
C to make travel easy and pleasant for the passengers
D to provide different services
E the shortage of qualified pilots
F travelling by air was very cheap
The United States was the country where______.
选项
答案B
解析 where后面明显需要填入一个语法上完整的句子，在五个选项中只有B是句子。
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