The forty years from the 1930s to the 1970s was an important period -题库考试答案搜索网

The forty years from the 1930s to the 1970s was an important period

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2021-07-17 17:40

A、inthedevelopmentofairtransportation
B、theearliestpassengerflightsweresuccessfullyoperated
C、tomaketraveleasyandpleasantforthepassengers
D、toprovidedifferentservices
E、theshortageofqualifiedpilots
F、travelingbyairwasverycheap

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