1。关于延期的理由, 仅申述一下商务活动较多并举例够不够?要不要找些证明材料?
-If possible, you may ask your cooperator/customer/sponsor to give you a letter indicating you need more time for your 商务活动.
一时找不出合适的材料。
2。以前转至B1签证时交过的材料,要不要再交一遍?
-At least you need to provide the proof you have enough money to cover your cost. Also provide the copy of your current I-94 (print it out online and provide the printed copy).
3。提前几个月申请较好?
-One to tow months.
多谢!