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高一英语(Unit 1):同义句转换:Scientists have made great progress in th

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高一英语(Unit 1):同义句转换:Scientists have made great progress in the research on
同义句转换:Scientists have made great progress in the research on the medicine but there is still a long way to go.
The medicine ____ ____ greatly ____ by scientists but there is still a long way to go.
高一英语(Unit 1):同义句转换:Scientists have made great progress in th
The medicine _has_ _been_ greatly _improved_ by scientists but there is still a long way to go.
再问: improve有被动语态吗?
再答: 有啊,及物动词都有被动语态的!