一英语改错题

这句话由现在分词的完成时结构（having done something）来充当时间状语，说明主句的谓语动词wrote发生在什么时候（发生在会议结束之后）。

be动词不要随便用。一旦用上，就会出现至少三种形态：
1）主系表：He is eleven.
2）被动语态： He was invited.
3）现在进行时态或者别的进行时态。He is cleaning his shoes. / He was cleaning his shoes when his mum came back.

所以，Having finished their meeting, ...是对的。

这种句子也可以用从句来表示：

After they had finished the meeting, they wrote ...（口语化的英语）
Having finished their meeting , they wrote...(书面语)

been 一加不就成被动了吗（是他们开完会，而不是他们被会开完）？having finished(having+done的形式：是主动语态，现在完成进行时。)

这是动词的进行时作主语，可以省略主语。在本句主语是THEY。Having finished 是完成式。去掉been是因为该句主语是they而不是meeting。

这个,我不会解释。。。