Depends on how you define "返美證" - 回複：請教：返美證還沒批下來，可否先回國，等返美證批下後寄回

Depends on how you define "返美證"
For AP - http://blog.wenxuecity.com/blogview.php?date=200710&postID=20710#AP
For RP - http://blog.wenxuecity.com/blogview.php?date=200804&postID=25254