There is no advantage in going so early. 去那么早一点好处都没有。

There may be some advantage in leaving here. 离开这里也许会有好处。

There is little advantage in buying so many books if you can’t read. 如果不识字，买这么多书就没有什么用了。

请问这里的 in doing sth 是什么句子成分？