Flying Disks were invented .
A．on the 1950s. B．in the 1950s. C．in 1950s. D．at twentieth century
1、B
科目：初中英語 來源： 題型：
Flying Disks were invented .
A．on the 1950s. B．in the 1950s. C．in 1950s. D．a(chǎn)t twentieth century
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