When I got back home I saw a message pinned to the door _______(read) "Sorry to miss you; will call later.

问题描述:

When I got back home I saw a message pinned to the door _______(read) "Sorry to miss you; will call later.
求答案及解释,谢谢.

reading
这个是比较常用的手法 意思就是 写到 说道
这里用现在分词 不用过去分词的被动 请注意了