我想大多数人地方都不会有这样的明文规定，
但是hr一定是有这样或者那样的倾向的。

如果他们因为没有opt而不想要你，多半会找到一些别的借口来得

If you don't have OPT, that means they need to file H1B application soon after April and you cannot work until Oct. 1, I doubt if any company would be willing to do that. Have you tried CPT instead?

对公司来说主要是你不能马上上班　　需要等你几个月　　这就得看公司愿不愿意了。