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多谢8老师，关于第二点 Don't file I-130 before they come to US.，这是因为file 130之后再用B-2 visa入境，会被海关阻止入境吗？

-Most likely, yes because your parents are your immediate relatives who are qualified to immigrate to US immediately (no 排期）。

我听说别人这样做过，不知您是否知道通过或禁止入境的先例？

-Some people may be lucky to get through because some IO at the port of entry may not pay attention to that.

那么，如果在国内开始file 130, 在485批准之前，还有无任何办法可以入境美国？

-Then, they need to apply for the immigrant visa to enter US and become a green card holder immeiately when they enter US (no need I-485 filing).