这是人教版必学5的一道翻译题的答案
This parclel of books is 250 yuan including postage and pack。
分词短语在这里干什么成分？表语补足语？
同意曹老师的解答，没表语补足语这种说法。
不过，我感觉including postage and pack“包含邮资和包装”理解为介词短语好像更好，作分隔定语修饰This parcel of books，由于不少词典都注明including是介词（目前分词演变而来）。如：
The price is £25.50, including postage and packing.《朗文》
Youll need a variety of skills, including leadership and negotiating.《朗文》
The price is $13,650, not including tax.《麦克米兰》
Stars including Joan Collins are expected to attend.《柯林斯》
Eight people, including two children, were injured in the explosion.《剑桥》
