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Thefamousscientistgaveanexcellentreportonhisrecentexperiment.这个空格中是填based,答案中的解析是说report与base之间是被动关系,用base的过去分词做定语.我不是很理解,被动关系不是应该用be+动

题目详情
The famous scientist gave an excellent report ___ on his recent experiment.
这个空格中是填based ,答案中的解析是说report 与 base之间是被动关系,用base的过去分词做定语.
我不是很理解,被动关系不是应该用be+动词过去式吗?
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答案和解析
这里是过去分词短语修饰report
相当于省略了 which was
The famous scientist gave an excellent report (which was)based on his recent experiment.