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English 13 Online
OpenStudy (tabdo1226):

The hot-air balloon launched by the Montgolfier brothers in 1783 was the ___ of the modern airplane. A. precursor B. conglomeration C. valor D. celerity

OpenStudy (anonymous):

what do you think?

OpenStudy (tabdo1226):

a

OpenStudy (anonymous):

yes! :)

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