As soon as he entered the room,the girl caught sight of the flowers ( )by her aunt.1.buying 2.being bought 3.were bought 4.bought原因写详细点（有什么语法或词组之类的）,劳驾各位了.我还有很多问题没人答,麻烦高手也去看看,
问题描述：
As soon as he entered the room,the girl caught sight of the flowers ( )by her aunt.
1.buying 2.being bought 3.were bought 4.bought
原因写详细点（有什么语法或词组之类的）,劳驾各位了.我还有很多问题没人答,麻烦高手也去看看,
答
bought
答
bought
前面省略了which were,原理跟你提的那个written一样。
答
bought
这是过去分词短语作后置定语，因为buy和flower是动宾关系，所以用过去分词作定语，由于是是一个短语作定语，所以后置
答
凭语感是buying吧，不过拿不准
答
As soon as he entered the room,the girl caught sight of the flowers ( )by her aunt.1.buying 2.being bought 3.were bought 4.bought 4.bought定语从句,省略which were