请问老师，由于imagine 的使用方法之一是接动名词或动名词复合结构，即 imagine doing 或 imagine sb.doing，那样2020年山东卷的这道题中:
As well as looking at exhibits, visitors can play with computersimulations and imagine ____ living at a different time in history orwalking through a rainforest.
句中，空上除去可以填themselves，还可以填their吗？
当然可以，例：
I can't imagine my marrying a girl of that sort.我很难想象与那种女生结结婚以后的情形。
Can you imagine their climbing the Great Wall?你能想象他们登上万里长城时的心情吗?
