In spite of all that has been said,the tourists have been picking leaves and cutting their names on the tree-trunk.

问题描述:

In spite of all that has been said,the tourists have been picking leaves and cutting their names on the tree-trunk.
cutting their names 为什么cutting 用进行时?

这里cutting their names和 picking leaves 是并列的动作 都是接在have been后面 是完成进行时