问题标题:
Thescientistsfounditwasnotpssibletoflyinthe18century.Thescientistsfounditwasnotpssibletoflyinthe18thcentury.(同义句)Thescientistsfound_______________________toflyinthe18thcentury.
问题描述:

Thescientistsfounditwasnotpssibletoflyinthe18century.

Thescientistsfounditwasnotpssibletoflyinthe18thcentury.(同义句)

Thescientistsfound_______________________toflyinthe18thcentury.

郭纲回答:
  itimpossible   findit+形容词   发现.怎么样不应加be动词
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