realizing that he doesn‘t have any money,he goes back sadly.问:realizing that是什么用法?realizing that 是引导一个句子吗?还是省略什么成分?

问题描述:

realizing that he doesn‘t have any money,he goes back sadly.问:realizing that是什么用法?
realizing that 是引导一个句子吗?还是省略什么成分?