Quails typically have short rounded wings that enable them to spring into f

Quails typically have short rounded wings that enable them to spring into f
quails typically have short rounded wings that enable them to spring into full flight instantly when disturbed in their hiding places.中的“when disturbed”为什么不是"when they are disturbed" 这个用法是什么语法,似乎对理解没问题,但是感觉总缺点什么成分!
英语人气:848 ℃时间:2020-04-03 02:55:10
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状语从句与主句的主语相同,且谓语部分有be的话,可把从句的主语和be一起省略能不能再举个例子,是不是所有的遇到这种情况都可以省略~?Professor Wang ill,the lecture was put off. Her money stolen,she couldn't buy a plane ticket for her home.
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