he was even seen reading in the toilet.为什么用seen
网友回答
被看见的意思.被动形式.
他被别人看到在厕所里读数.
he was even seen reading in the toilet by sb.
======以下答案可供参考======
供参考答案1:
被动语态be seen被看见
供参考答案2:
用还原法see sb doing sth看见某人在做某事------even saw him reading in the toilet甚至看到他在卫生间里读书------he was even seen reading in the toilet.甚至有人（注意这个主语不明确，所以可用被动语态）看到过他在卫生间里读书。