问题标题:
Thescientistsfounditwasnotpossibletoflyinthe18thcentury.保持原句意思Thescientistsfound_______________________toflyinthe18thcentury.
问题描述:

Thescientistsfounditwasnotpossibletoflyinthe18thcentury.

保持原句意思

Thescientistsfound_______________________toflyinthe18thcentury.

黎仁蔚回答:
  it'simpossible
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