【过去分词作后置定语与被动语态用法有什么区别（不是结构上）以下题分析!A:WhatareonshowinthemuseumB:Somepictures(drawn/weredrawn)bytheAfricans.答案是drawn对的,weredrawn被动语态怎么不行呢】

　　过去分词作后置定语与被动语态用法有什么区别（不是结构上）以下题分析!

　　A:Whatareonshowinthemuseum

　　B:Somepictures(drawn/weredrawn)bytheAfricans.答案是drawn对的,weredrawn被动语态怎么不行呢