27.All US commercial space cargo will in the future have to fly on ________. (NASA’s New Plans for Space Shuttle Launches) A)military rockets B)NASA space shuttles C)private industries’ rockets D)rockets of foreign countries

27.All US commercial space cargo will in the future have to fly on ________. (NASA’s New Plans for Space Shuttle Launches)
A)military rockets
B)NASA space shuttles
C)private industries’ rockets
D)rockets of foreign countries

出自：英语（专升本）

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