The scientists found it was not pssible to fly in the 18 cen
The scientists found it was not pssible to fly in the 18 century.
The scientists found it was not pssible to fly in the 18th century.(同义句）
The scientists found ____________ ___________ to fly in the 18th century.
The scientists found it was not pssible to fly in the 18th century.(同义句）
The scientists found ____________ ___________ to fly in the 18th century.
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