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
Nowadays airports provide all kinds of services______.

选项

答案C

解析 填入的动词不定式短语是机场提供各种服务的目的状语。
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