1、拿到移民簽證後還要交綠卡申請費嗎？EB1a類的
-You only need to pay the immigrant fee which is used to produce the plastic green card. See:
https://www.uscis.gov/file-online/uscis-immigrant-fee
https://www.uscis.gov/tools/how-do-i-customer-guides/how-do-i-pay-uscis-immigrant-fee
2、入關以後要多久可以拿到綠卡？
-You become a green card holder immediately after you entering US. You will receive the plastic green card in about one month.
3、在拿到綠卡之前可以短期回國嗎？
-Yes, but if you go back and forth between China and US too often, you will have trouble. So, you may apply for reentry permit which allows you stay in China for > one year < two years.
必須回國，因為國內還有生意不能長時間離開
4、如果主申請人最後放棄綠卡，會取消副申請人綠卡嗎？
-No.
多謝8老師
