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Aftertheyhadwatchedmanysleepersclosely,researcherscametoaconclusionthatpeoplesleepwiththeireyesclosedbutnotallthetime.其中没有助动词be为什么用被动语态?解析上说的是被动语态!

题目详情
After they had watched many sleepers closely,researchers came to a conclusion that people sleep with their eyes closed but not all the time.其中没有助动词be为什么用被动语态?
解析上说的是被动语态!
▼优质解答
答案和解析
with sth adj/done,是with的一个用法,指伴随着某物在一个什么样的状态.