faint 刚仔细看了一下 确是不行。 烦人 我已经约了墨西哥了 只能取消了 现在
去canada申签证也来不及了。 :( http://matamoros.usconsulate.gov/non-immigrant_visas/third-coun
Who Cannot Apply in Mexico?
Applicants who entered the U.S with one visa category and are seeking to
return to the U.S. with a different visa category.
