He has bought dozens of books,including an English novel.

这里考查include的介词用法~
记住这个：
including + 宾语 = 宾语 + included
你就可以判断到底是用including还是included了~
在宾语前面的用including,在后面的用included
刚好你提问的两个句子包含了这两种用法~也可以互相转换
He has bought dozens of books,including an English novel
=He has bought dozens of books,an English novel included
including an English novel 和其后的名词/代词一起形成介宾短语,意思是“包括...在内”.
Everyone is going to visit the Great Wall,me included
=Everyone is going to visit the Great Wall,including me.

including an English novel做伴随状语，补充说明books