回复:I-485 Pending, 我想放弃I-485回国工作,儿子在读大学. 请教大
I asked xiaobaitu earlier. If the I-485 is not employer sponsored, such as NIW, you can file I-824, and wait in China.
Here is site that provides some detailed info. You can always consult a lawyer.
http://www.immihelp.com/greencard/adjustment-of-status-vs-consular-processing.html