The scientist made the great invention when he was over seventy.换为···invention ___his____?

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• The scientist made the great invention when he was over seventy.换为···invention ___his____?
• The scientist made the great invention when he was over seventy.改句意相同The scientist made the great invention ______ his ________.
• Edison is a well-known American inventor. 完形填空悬赏高分,急!Edison is a well-known American inventor. He was taught by his mother when he was a child. Later he learned things (1) _ himself by reading and experimenting. He built a lab for himself to work in, and he worked very hard in his sixty years of scientific activities. He made over a thousand inventions. (2) _ inventors in the world could have such great success. Edison’s first invention was
• The scientist made the great invention when he was over seventy.换为···invention ___his____?
• The scientist made the great invention when he was over seventy.
• Here`s my card.Let`s keep in ----.A tough B relation C connection D friendship
• this inventor made the invention when he was over sixty.（同义句转换）