再次请教8 老师， 先谢谢您
父母今天绿卡面试，父亲通过， 母亲因两次指纹均未合格，需要警察局出示无犯罪证明，现已拿到。 因家中有事他们必须尽快回国，两人都有回美证，
- 母亲是否可以用回美证先回国，然后在回美证到期之前再回来?
- 父亲在面试时已告知被批准，但批准的通知信上有段话：
If you have an emergent immediate and justifiable need to travel outside the United States and cannot wait to receive your PRC, you may obtain temporary evidence of your lawful permanent residence by making an Infopass appointment through www, uscis.gov and appearing at a USCIS office with this letter and a valid unexpired passport.
我不知道父亲的情况是否还能用回美证？如果能的话， 是不是就不用去移民局申请temporary evidence of your lawful permanent residence了呢？
3．下次从中国出境的时候，只出示回美证/护照中国海关就应该放行吧，总是有点儿担心。
非常感谢您的帮助！